I was scratching my head about this one but I am trying to find out if I interpreted this scene correctly from Season 3 Episode 2 "Don't Be Ridiculous". Nora and Tom are talking in the car about him being adopted.
Tom mentions when he was told he was adopted that he looked for 10 years for his biological father, and when he found him, he mentioned he had a family and kids and wanted nothing to do with them.
Later Nora laments that she wishes Tom had never left the baby on her doorstep that day, and Tom replies,
I didn't leave her for you... I left her for my dad
That got me thinking, he thought Nora's house was his biological Dads house, and he probably didnt even know who Nora was. That would mean Noras departed husband is in fact Tom's biological dad and neither of the characters probably know this yet.
Somebody I was talking to insists that Tom didnt leave the baby at Noras house and instead left it at his adopted Dads house, which is a far less interesting outcome because that just means he couldnt take care of the baby and was dumping it on his adopted Dad Kevin to take care of.
So I am confused now, which of us are right here? Do we actually know who Toms biological dad is at this point in the series?