#1)Which president had the most children? How many children did he have? How many lived past age 18?

#2)Which presidential grandchild married a presidential child?

#3)Who was the first presidential child to get married in the white house? Who was the spouse?

#4)How many presidents had no biological, legitimate children? Who where they?

#5) How many presidents had no children to live past the age of 18? Who where they?

#1 John Tyler had 15 children, and it appears 14 of them lived to maturity.

#3 On March 9, 1820, Maria Hester Monroe to Samuel Lawrence Gouverneur

I will leave the rest for someone else, or for a later date, as I hate to run trivia out of open Q's !

#4
George Washington *, James Buchanan, Andrew Jackson *, James K. Polk, James Madison .

* = adopted children.

Note: Warren Harding had no legitimate children. He had a child by his mistress Nan Britton.

So if we elimate adopted children we are left with James Buchanan , James K. Polk , James Madison . (3 James....hum! )

Tyler, who was born during Washington's administration, had a daughter born just before Lincoln's administration, in 1860. That daughter, Pearl, died during Truman's administration. I believe one of Tyler's grandchildren is still not only alive, but active and in good health. I find that amazing, and telling of just how young the US is, that three generations of one family cover the time periods of all US presidents.

From various pages of Wikipedia -

In all, Tyler had fifteen children, eight with his first wife Letitia and seven with his second wife Julia. His last surviving child, Pearl Tyler, who was also his last child born, died on June 30, 1947, one hundred years, one week and six days after the death of his first child, Mary Tyler.

* By Letitia Christian Tyler:

Mary Tyler (1815-47); Robert Tyler (1816-77); John Tyler (1819-96); Letitia Tyler (1821-1907); Elizabeth Tyler (1823-50); Anne Contesse Tyler (1825); Alice Tyler (1827-54); Tazewell Tyler (1830-74)

* By Julia Gardiner Tyler:

David Gardiner Tyler (1846-1927); John Alexander Tyler (1848-83); Julia Gardiner Tyler (1849-71); Lachlan Tyler (1851-1902); Lyon Gardiner Tyler (1853-1935); Robert Fitzwalter Tyler (1856-1927); Pearl Tyler (1860-1947)

John Dunjee claimed to be the illegitimate son of John Tyler, a child of Tyler and one of his female slaves. There was also a mulatto woman who frequently traveled with the Tyler family who was alleged to be the president's daughter.
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Lyon Gardiner Tyler (August 24, 1853 – February 12, 1935) was a U.S. educator and historian. He was the son of President John Tyler and First Lady Julia Gardiner Tyler, born at Sherwood Forest Plantation. He graduated in 1875 at the University of Virginia. From 1888 to 1919, he served as the seventeenth president of the College of William and Mary (W&M), and is widely credited for restoring the college's financial condition following the deterioration which took place in the wake of the American Civil War. He was married twice, first to the former Anne Baker Tucker, with whom he had three children, John Tyler, Elizabeth Gilmour Tyler, and Julia Gardiner Tyler. Following Anne's death in 1921, he married the former Sue Ruffin, with whom he had three children, Lyon Gardiner Tyler Jr., Harrison Ruffin Tyler, the current owner of the Sherwood Forest Plantation, and Henry Tyler, who died in infancy. [1]
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Sherwood Forest Plantation is located on the north bank of the James River in Charles City County, Virginia. It is located on State Route 5, a scenic byway which runs between the independent cities of Richmond and Williamsburg. The house is located approximately 1.5 miles (2.4 km) from the river.

Sherwood Forest has the distinction of being the only private residence in the United States to have been owned by two unrelated United States Presidents. William Henry Harrison inherited the plantation, then named Walnut Grove, in 1790 and held it for three years. He sold the 3,000 acre (12 km²) property in 1793 having never lived in the house. Harrison's successor John Tyler purchased the plantation, which by then had been reduced to 1,600 acres (6.5 km²), in 1842 and lived there after leaving the White House.

The house has been in the Tyler family since it was purchased by president Tyler in 1842. The house is currently owned by Harrison Ruffin Tyler, President Tyler's grandson, and the son of Lyon Gardiner Tyler. It is open to the public for tours.
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From http://www.sherwoodforest.org/ -

Tyler's 2nd Marriage and Children -

Married Julia GARDINER (23 Jul 1820 - 10 Jul 1889)

1. David Gardiner TYLER (12 Jul 1846 - 05 Sep 1927) married Mary Morris JONES (1865 -1931)
1. Mary Lyon TYLER (1895 -1975) married George Peterkin GAMBLE (b. 1899)
2. Margaret Gardiner TYLER (03 Feb 1897 - ? ) married Stephen Fowler CHADWICK (1894 -1975)
3. David Gardiner TYLER (b. 1899) married Anne Morton SHELTON (1900 - 1977); married Marion Field McWhorter WEBB
4. James Alfred Jones TYLER (1902 - 1971) married Katherine THOMASON (1909 -1967)
2. John Alexander TYLER (07 Apr 1848 - 01 Sep 1883) married Sarah Griswold GARDINER (1848 - 1927)
1. ? TYLER (1876 - 1876) born Christmas at Sherwood Forest
2. Samuel Gardiner TYLER (1879 - 1892)
3. Lillian Gardiner TYLER (1879 -1989) married Alben N. MARGRAF; married -?- FARLOW
3. Julia Gardiner TYLER (25 Dec 1849 - 08 May 1871) married William H. SPENCER
1. Julia Tyler SPENCER (1871 - 1955) married George FLEUROT; married W. (or H.) Durant CHEEVER
4. Lachlan TYLER (02 Dec 1851 - 26 Jan 1902) married Georgia Webb POWELL
5. Lyon Gardiner TYLER (24 Aug 1853 -12 Feb 1935)
1. Married (1) Anne Baker TUCKER (1857 -1921)
1. Julia Gardiner TYLER (1881 -1965) married James Southall WILSON (1880 - 1963)
2. Elizabeth Gilmer TYLER (1885 -1976) married Captain Alfred Hart MILES (1883 - 1956)
3. John TYLER (1887 -1969) married Elizabeth PARKER (b. 1894)
2. Married (2) Sue RUFFIN (1889 -1953)
1. Lyon Gardiner TYLER, Jr. (b. 1924) married Lucy Jane POPE (b. 1924)
2. Harrison Ruffin TYLER (b. 1928) married Frances Payne BOUKNIGHT (b. 1933)
3. Henry TYLER ( 1931 - 1931)
6. Robert Fitzwalter TYLER (12 Mar 1856 - 31 Dec 1927) married Fannie GLENN
7. Pearl TYLER (20 Jun 1860 -30 Jun 1947) married William Munford ELLIS (1846 - 1921)
1. Pearl Tyler ELLIS (1885 -1979)
2. John Tyler ELLIS (b. 1887) married Helen Rogers WATSON (d. 1983)
3. Leila MacLachlan ELLIS (b. 1888) married Ambrose Madison MARYE (b. 1887)
4. Cornelia Horsford ELLIS (b. 1891) married Yolverton Evans BOOKER, Jr.
5. Gardiner Tyler ELLIS (b. 1893)
6. William Munford ELLIS (1891 -ca. 1922) married Ruth WOODS
7. Julia Fleurot ELLIS (1898 -1988) married William K. ROBINSON (d. 1962)
8. Lyon Alexander ELLIS (1900 - 1954 ) married Margaret NORTHCROSS
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Note the ages at which some of Tyler's children died.

quote:

#5) How many presidents had no children to live past the age of 18? Who where they?

Here we go: There were 31 all together that I found Source

1) Suzanna Adams 1768-1770
2)Jane Randolph Jefferson 1774-1775
3)Son (no name)Jefferson 1777-1777
4)Lucy Elizabeth 1 Jefferson 1780-1781
5)Lucy Elizabeth 2 Jefferson 1782-1784
6)J.S Monroe 1799-1801
7)Louisa Catherine Adams 1811-1812
8)James Findlay Harrisson 1814-1817
9)Anne Contess Tyler 1825-1825
10)Octavia Pennel Taylor 1816-1820
11)Margaret Smith Taylor 1819-1820
12)Franklin Pierce jr 1836-1836
13)Frank Robert Pierce 1839-1843
14)Benjamin Pierce 1841-1853
15)Edward Baker Lincoln 1850-1862
16)Thomas Lincoln 1853-1871
17)George Crook Hayes 1864-1866
18)Manning Force Hayes 1873-1874
19)Eliza Arabella Garfield 1860-1863
20)Edward Garfield 1874-1876
21)William Lewis Arthur 1860-1863
22)Ruth Cleveland 1891-1904
23)Katherine McKinley 1871-1875
24)Ida McKinley 1873-1873
25)Quentin Roosevelt 1897-1918
26)Calvin Coolidge jr 1908-1924
27)Franklin Roosevelt jr 1909-1909
28)Doud Dwight Eisenhower 1917-1921
29)Child still born Kennedey 1955
30)Patrick Bouvier Kennedey 1963-1963
31)Pauline Robinson Bush 1949-1953

quote:

Originally posted by DorianGreyed:
Tyler, who was born during Washington's administration, had a daughter born just before Lincoln's administration, in 1860. That daughter, Pearl, died during Truman's administration. I believe one of Tyler's grandchildren is still not only alive, but active and in good health. I find that amazing, and telling of just how young the US is, that three generations of one family cover the time periods of all US presidents.

Tyler's breeding prowess was recently a Jeopardy clue (which I guessed correctly... one of those factoids I can never make myself completely remember).

#2 - Julie Nixon (daughter of president) married David Eisenhower (grandson of president) on Dec. 20, 1968.