Starting with the son of a Hall of Famer and the brother of a Hall of Famer.
Lou Boudreau's son played five minor league seasons, reaching as high as AA.
Albert "Butts" Wagner was the brother of Honus Wagner. Albert played one season in MLB.
Here's a much better picture of the older brother:
Ralph Garr Sr. played 13 major league seasons. His son, Ralph Jr. played just four seasons in the minors, topping out at Single A.
I don't follow the NBA much these days, but I do know the name Donovan Mitchell. He's been an All-Star the past four seasons, beginning his career in Utah and now playing for the Cavaliers. The minor leaguer with the same name reached AAA with the New Orleans Zephyrs in 1998.
See my full list here: Wax Pack Wonders: The Lesser Knowns. And click here for some additional posts about these players: Wax Pack Wonders: Lesser Known. I'm always on the lookout for more cards to add to the list, so feel free to add suggestions in the comments below.