Me & SO have been together 3 years and live In a different city to my parents.

We recently spent a week with them and my pops was the only family member that didn't bond with SO. He sometimes doesn't greet him, is resistant to conversation, avoids eye contact and only really talks to him to do the whole 'I'm watching you' dad threat thing. Me and dad are super close (speak every day), and it Its made SO feel rejected and unwelcome - he's feeling really down. Dad hasn't mentioned any major issues to me, and SO having tried hard during our trip has now said he'll respect my dad but doesn't want a relationship with him after being treated like that.

considered talking to my dad about it and saying that I noticed (rather than saying SO bought it up), but I'm worried aboit some sort of confrontation. also thought about raising it with Mom... any ideas?