This sounds quite complicated but could have a simple solution, depending on how you look at it. Reading between the lines, it sounds as if your cousin wishes to have a more 'grown-up'wedding with very few (young) children. The children who are included in the wedding party seem to be exempt from this, her choice. If you and your sisters can see it as a chance to catch up on relatives, arrange for a babysitter and enjoy your day off! Maybe you could all leave your children at home so your sister with the smaller children does not feel penalised. Try not to let it interfere, I'm sure the bride is not intending any harm, it's very difficult trying to get it 'just right' with everyone. Hope this helps

I would speak to your cousin and see what she has planned for the evening reception. If you’d feel happier leaving your young daughter with your in-laws, perhaps you could explain to her that you’ll be able to relax more without your daughter being there. Maybe your cousin included your daughter on the invitation as she wasn’t sure if you could get a babysitter and felt that inviting your daughter would mean you could be there for her. I’m guessing that the elder children are invited as your cousin feels that they could handle a later night whereas perhaps the younger children couldn’t. If you have a good relationship with your cousin, you might like to mention that one sister is upset because her children aren’t invited. I’m sure there’s no malice intended, your cousin has probably made assumptions about the children but just not explained things very well. Maybe by adding ‘adult reception’ to the invitations, she’s trying to dissuade other guests from bringing children – does the venue have restrictions on numbers? Do try and talk to her and get to the bottom of this before the wedding rather than letting this issue cloud the wedding day. Good luck..

This is a very awkward situation and your cousin should perhaps have explained in person to each sister why some of the children have been invited and some not. Perhaps she feels that the younger toddlers would be more disruptive than a baby and older children? If at all possible, I would ask your in laws to baby sit for you, then you can relax and enjoy the wedding. This may also make your other sister feel better as she wont be the only one there without her children! Good luck!