Buster Keaton talks about his family (1958)

Family portrait (Love Nest on Wheels, 1937).
From top right, clockwise: Buster Keaton, his mother Myra,
younger sister Louise, and younger brother Harry.
You can find this movie on youtube:part 1
part 2

Interview with Buster Keaton, Robert Franklin and Joan Franklin, 1958. From the book: Buster Keaton Interviews, Kevin W. Sweeney ed. (I recommend this book!)

"My mother's father, named Cutler, had a medicine show, and my mother was part of it. [...] My mother was playing in this show - could play piano, bass fiddle, and a cornet - from the time she was twelve years old. So when she grew up she played old maid parts in shows. She was liable to play anything, from [From] Rags to Riches to Way Down East.
My father came from an Indiana family on the outskirts of Terre Haute, called Dogwalk. He first heard about the gold rush in California, so he rode freight cars and bummed his way out to get into that. Not much luck. He got back home. About that time, Oklahoma opened up the Cherokee Strip, so he went into that, and got himself 160 acres near Perry, Oklahoma. The man going alongside him - they became great friends at the time - was Will Rogers. Couple of years later, they opened up Oklahoma proper, and he went back into that one - another land rush. This time he headed for Perry itself and got two city lots. On the first one, on the Cherokee Strip, he left home with $8, and on the border, before he entered the Cherokee Strip, he bought $1 worth of bacon and beans and $7 worth of ammunition, because you had to stay up day and night to protect our claim stake. If they'd catch you sleeping, they'd just knock you in the head, take your name off it, and put their own up. [...]
He established this second one from the Oklahoma rush, waiting in line to clear his claim, when this medicine show of Cutler's came through. He goes in and sees the show and falls for the soubrette, who is now seventeen. Soon as he gets his claim filed, he joins the show as a stagehand and works his way into playing bits in the show, and it was just a natural thing for him. He was a natural dancer, a great pair of legs to do eccentric work and high kicking, and a natural clown. He was with the show about six months; he and my mother were married. I was born on a one-night stand at Piqua. They left my mother there for two weeks, and then she rejoined the show with me, and I've never seen the town since."

Buster's father appeared in several films too. In The Neighbours (1921), Buster's father plays... Buster's father! He makes his entrance at 1:25.

Here's part 1

And here's part 2