How do I handle this?

♍️💟

I’m going to tell the short version of this story because there’s too much to type.

Basically, my husbands uncle is in a “throuple”. He is in a relationship with a man and a woman separately. The man and the woman aren’t in a relationship together, they just share him. He brings them both to family get togethers and everyone likes them both. Nobody judges him, including me.

This Christmas my husband and I were at his family’s house and the uncle and his SOs were there. I kept catching weird flirty things the man would say to my husband, but I kept it to myself because it was my first time meeting him and I wasn’t sure if it was just his personality. He also was kinda touchy... later on in the night he stood behind my husband and began massaging his shoulders. I said something about it in a “joking” manner, just to let him know that I saw him doing it, and he moved to my shoulders for a bit like he was trying to include me but it still stuck in my mind because of the other things he’d said and how he’d acted.

I never mentioned it to my husband but a day after coming home he brought it up to me and said he felt like the man had been kind of flirty with him. My husband and I are much younger than this guy is so we both thought maybe he just saw my husband as too young to be interested in (we’re the “kids” kind of).

What do you all think? If it happens next time we are around them should we say something? I don’t want to offend him but I don’t feel his behavior is appropriate. It makes me uncomfortable watching someone act like that towards my husband. I’m not sure how he feels because I haven’t asked him directly but he brought it up and spoke about it like it made him uncomfortable too.