My two daughters are dating boys who happen to be brothers. The girls are 19 and 21. My older daughter was with her boyfriend first and then due to being in the same social circle the other daughter got with his brother. They kept it a secret for 6 months. Life alphas become very difficult, the girls argue over the boys and the ethics of being together with brothers and the boys already hate each other. We all were planning on going on holiday together and the older girl and boy are saying they won’t accept their relationship and cause issues every time they are in the same room. They younger brother wouldn’t be my choice for my younger daughter but I don’t want to push her out of family things and do things with just one of the boys. The older brother lives with us. What also doesn’t help is that the boys mother stirs up issues between the boys. We are supposed to be going to Spain together soon but I don’t know what to do. Do I go alone and let them all do their own thing or push for the holiday. We have always been so close.