I don't know whether this is a problem or not - I don't even know if I am as bothered as I think I ought to be, but basically DSS(6) can get through most of a contact weekend (or even holiday) with the barest of acknowledgements that I exist, and that's only if DH presses him to answer a question or be polite.
I'm not overly effusive with DSS as I sense that would make him feel uncomfortable but I do make sure he feels welcome at our place and fully part of the family (two other DC at home). DH is really supportive and does pick up when there is blatant rudeness, but that's pretty rare - I'm normally just ignored eg he will run straight past me in the hall and not make eye contact, has to be told to say goodnight to me, ask DH for a drink when DH is busy and I'm free and happy to do it.
DSS used to play really nicely with the other DC (one step, one half) but is leaning ever further towards just wanting to spend time with his dad and the other DC are picking up on it. Obviously it's difficult for him being between two homes but, because of circumstances, he actually has quite a lot more one-on-one time with his dad than the other DC so we can't deal with any insecurity by giving him even more time and attention. (I do try chatting with him, doing activities etc but it is clear he is only answering/joining in because he knows he has to and is just going through the motions - slightly soul-destroying for me tbh).
Has anyone else experienced this as a phase? Any tips on dealing with it? There doesn't seem to be any actual bad feeling on his part so I don't know if we should challenge it or not.