DSs (8 and 6) have a cousin (7) who is between them in age, though slightly closer to ds2.
Whenever we meet up with him (rarely) he always pairs off with one of the boys, and the other is left isolated and rejected, and it causes real problems.
He's a lovely lad, and I'm sure it's not his fault, I think it's the dynamics of three-somes. But I just don't know what to do with it. In the past we've had him to stay, but this year I've been reluctant to invite him as it's caused such tension in the past.
They don't live close to us, so it's not just a point of inviting a friend of ds1's to play for the afternoon ... and I don't think I could cope with inviting a friend to stay for a few days as well and having 4 little boys in the house!
Any suggestions?