That is tough. If you are not excluding other family (as in the only family with children are in the wedding party), I think this can work. I would stick to to the tips outlined in this post: Tell parents of the ring bearers and flowers girls, that you would like their children to be in your wedding party and that they will be the only children at the reception (or part of it). If they are only welcome at part of it, you must realize that means you lose the parents too unless a sitter can pick them up. When telling other parents that the wedding is adults only, be sure to specify, while you are having children participate in the wedding party, they will not be staying for the whole reception. Treat your written invitations the same – “adult only”. Your family will know the wedding party situation and you’ll be able to count them accordingly. Hope this helps. Best of luck with your wedding!