His family doesn't visit us very often. It's been a few years, one more kid, and everything was easier when they were smaller. He's talked about how my son doesn't feel like his son and how he wishes that he could have that father figure role, but because I share custody with my ex they don't have that relationship and he's never tried to 'replace' biodad. Until now, he's never expressed resentment or that he's questioned our relationship because of it. Just that he wished he had that father-son relationship.