Billy Ripken, 22, joins his brother Cal Ripken Jr. in the Orioles’ starting lineup in Baltimore’s 2 – 1 loss to the Twins. Orioles manager Cal Ripken, Sr. is the first to manage two sons in the majors.

This Day In Baseball

On July 11, 1987Billy Ripken, 22, joins his brother Cal Ripken Jr. in the Orioles’ starting lineup in Baltimore’s 2 – 1 loss to the Twins. Orioles manager Cal Ripken, Sr. is the first to manage two sons in the majors.

Source
Baseball Reference July 11