Seventy-three years of marriage isn't a milestone William Daniels and Bonnie Bartlett Daniels ever thought they'd reach, especially after they had a brief open marriage early on in their relationship.

"Bill had left the church. My family wanted it to be an Episcopalian and I said, 'No,'" Bonnie tells PEOPLE David Livingston/Getty Images Bonnie Bartlett and William Daniels William Daniels and Bonnie ...

Bonnie Bartlett has had a long, successful television career playing a wide variety of roles, including Grace Snider Edwards on Little House on the Prairie, Ellen Craig on St. Elsewhere and Lila ...

William Daniels turned 97 this year, while his wife recently turned 95. However, it’s not just their long lives as individuals that are remarkable, but also the 73 years they have spent together as a ...

William portrayed teacher and neighbor Mr. Feeny in the '90s coming-of-age series, while Bonnie appeared in five episodes as Dean Lila Bolander, Mr. Feeny's eventual wife William Daniels is nostalgic ...