I disagree with the hive mind on this one. You said in a comment you aren't going to stay and support your sister because of a nasty breakup. Even though your married why should your family obligations that would have been going on for a few weeks? halt a trip he got invited to? He didn't actively plan this trip and he has tried in the past to go with you and has confirmed he still wants to go with you in the future. You guys had to drop money for a new car but is he using his own fun money for this trip? since he is only going. If he is using his own fun money again what's wrong with that? If work opportunities halted him previously but now things shifted at his job that he can use his vacation days for this trip what makes him not allowed to do? It's seems your upset because he gets to go to Europe and you don't. You even said you've been to England before and he hasn't. I mean I get it you guys wanted to do this together. He has actively tried to make that happen but for reasons you guys can't together YET. He still wants to go with you next year to begin with. You even said you haven't been traveling or doing as much since work and life has gotten in the way but now since his life has freed up alittle he can't go because you can't? Nothing is stopping you from setting up a trip with your friends in the future you just valued your sister more then Europe and that's a fair viewpoint but he doesn't nor should he have to. He clearly is willing to work with you to go to Europe in the future and has tried in the past. I think he can go as long as he uses either his own fun money or money from his savings. This seems more your upset he can go and you can't but it's not like you weren't given the chance. This is going against the grain but if he uses his own money and vacation time nothing wrong here.