An Indiana Pacers star isn’t happy with Purdue head coach Jeff Brohm, and he made that pretty clear on Twitter.

A few weeks ago, Brohm was asked about the outlook of defensive end Gelen Robinson, a senior for the Boilermakers. And while the new Purdue head coach was optimistic about Robinson’s talent, he didn’t seem too sure about the commitment level:

That’s not an unusual thing for a coach to say. Trying to motivate a player by using a phrase “when he wants to play,” is a pretty common thing to hear. Apparently, though, Robinson’s older brother didn’t appreciate the comment.

Glenn Robinson III, a member of the Pacers, caught wind of Brohm’s comment on Saturday. He had a few words of his own for Brohm:

I guess when you mess with one Robinson, you pick a fight with the family.

And, in Brohm’s defense, he has been pretty great thus far in his career, winning back-to-back C-USA titles at Western Kentucky.

Gelen and Glenn are the sons of Glenn Robinson, a star for Purdue’s basketball team back in the 1990s. He was awarded the National College Player of the Year in 1994 and was the first overall pick in the 1994 NBA Draft.

Glenn Robinson III was a standout on Michigan’s basketball team from 2012-2014.

It’s pretty clear, though, Brohm isn’t scared of the son of a Boilermaker legend.

Gelen started in 10 games last season and made 61 tackles, including eight stops for loss. He’s made an appearance in 33 games during his three seasons with the Boilermakers.