Not big on this mod for that alone. His name is not Keith!

Yes, ninjamuffin99 said it in the game!
KEITH
NOT HIS NANE

name*

Well, did you really expect his big brother to call hom boyfriend?

*S W E E T H O M E A L A B A M A I N T E N S I F I E S*

Good point, but he could've just gone with 'bro' or 'little bro.'

what happened was the mod creators did not want him to call his little brother "boyfriend" and they already had Keith as a place holder, but they ran out of time and just stayed with Keith, so maybe Keith is a nickname?

Imagine if his own brother called him boyfreind...

Again, they could've just went with 'little bro.'