Who are the only mother-and-son songwriters to each have written a number one Billboard pop hit? [Bonus: name the artists and the songs.]

In 1971, Hoyt Axton wrote "Joy to the World" for Three Dog Night and it became their 2nd number 1 hit. His mother, Mae Axton, wrote Elvis Presley's "Heartbreak Hotel" 15 years earlier.

Yep! Thanks GA!

So how many bonus points did I earn?

20