Having had both a Father and a Dad, I will add this.
Father was a great guy, used to watch him chase my mother down the hall with a sweeper hose. He died when I was 12.When I was told, I rolled over and went back to sleep.
My Dad walked on water. He was 20 years older than my mother and raised me from 12 to when he passed away when I was 28.
Point here: sex does not make a parent, love does. I have a vasectomy and if the wife got PG, we would raise the child with no issues and love it as our own as it would be. The other “dad” would be informed and what relationship he has will be up to him. To keep strife down, we would leave telling his wife up to him as he may not want her to know; his call.
We hope to never have this issue as our standing rule is No V, No play. There are too many folks out there to choose from to play with. Those not taking the simple step of protecting all involved do not play in our playground.