Go, you already know you want to go. H can go or not, but you have one shot to visit with all siblings and I hope you take it. Don't let him make an issue out of it, just tell him it is going to happen and you hope he will go with you, if not he can spend the day with his mom. I truly hope you go and enjoy yourself. As we get older the times we have with extended family becomes so rare a gift I hope you take advantage of the opportunity. It will be a gift to your daughter as well.