Eh, not so much, they did bond Kevin Party a bit. If anything, Marty is the worst one.

yeah Kevin at least has a small form of emotional baggage since it seems like he had a really bad breakup at one point.

Marty is just a money grubbing douche who basically abandons his biological son and has no qualms about exploiting said son for advertising when expedient… But at least Marty seems to be on the level legally at least and didn't try to steal Greg's check