Hello - we have not spoken to my husbands brother for 10 years (big family fall out when their dad died). Family caused us lots of issues over the years and were manipulative with wider family. Tried several times in early years to sort it out but always ended badly (including both police and a court case and my husband losing job because of their actions!). Not heard from them for a few years and have enjoyed the peace and no drama. Our son is 15 - their son is just about to be 16. They don’t know each other well but seem to be connected on social media. Their son is having big 16 birthday party in November. Our son has just announced he has been invited by the other boy and is going. Our son knows bits of the history but always protected him from it and them and they have tried to get to us via our son over the years. I really feel like I don’t want him to go due to all the anguish over the years and feel they are again being manipulative. They have not contacted my husband or I. Am I being unreasonable?