basically it's somehow the only marriage that stuck partly because at that point his dad had left working full-time to do whatever old, well-off venture capitalists do. mainly travel with his wife. in my head, the dad did make a point to treat all the kids like his regardless of how the previous marriage ended; so a lot of holidays, graduations, and vacationing together and overall creating this weird, blended family. and that means ben having a sibling half his age consistantly pestering him and dropping by unannounced to raid his fridge and hbo max account.