YES, I kept waiting for the hospital staff to go like 'so how does this threesome relationship work'? (which would of course not have fit at all in the moment, but we could have least have gotten some cut-away reaction shots of weighty glances) I have to admit, the only one who has so far gotten the short end of the daddy denomination stick for me is actually Cas. I mean, he was the one who basically stubborned Jack into being by protecting him, until he could be born, but in my rememberance, hasn't got to do much daddy-ish stuff till then. Maybe I'm suppressing some stuff there, but felt to me like his role was way more marginalized than Sam's. Idk. I do find I have to rewatch the episode now though and use the unexpected no rehearsal freetime of the evening to ponder that some more.