Lol, Spaceballs is the perfect format for this.

What the hell am I looking at?

I know it’s not the point of the joke but

Father’s brother’s nephew, assuming the father doesn’t have any other siblings, would mean a sibling of the person in question. Then cousin would mean a child of the father’s brother (uncle).

If the father has additional siblings, the end result is still just a cousin or sibling of the original person in question’s roommate. Not very many steps removed compared to how it originally sounds :p

Edit: this is assuming the uncle isn’t married and has in-laws with a nephew on that side, which I didn’t think about originally. So it could be not circling back on itself but hey I already wrote the comment so