Thanks for all the replies.
I guess in the end I just don't really get it. It's not about keeping up appearances for me, but rather not upsetting my mother. I travelled to his wedding (not as far as Korea, but I took time off to be there) and wouldn't have dreamed of not going. To me, family is important, even if we don't really get on. It's not like we hate each other, we just don't have much in common. Increasingly, he is pushing me away and I am not really sure why.
MistressDeeCee not sure where you got cajoling and begging from. I invited him. He said he didn't have money. He told my mum. She said she'd pay, I also offered to pay. There's been no more energy expended than that.
RealityCheque I offered to pay for everything, not just the flight ticket. I know he hasn't booked any holiday because my mum told me, but he was planning on going away. Of course he doesn't have to take time off for me if he doesn't want to, I just feel bad that he doesn't care enough about my mum to do so. He's married, no kids.
SoThatHappened South Korea.
Maryz A small wedding in Korea is never going to happen. They invite the world and his wife, besides which I don't have much family at all, and most of my close friends are going to travel here for the wedding. We are planning a small reception in the UK next year, but honestly, not sure I will even invite my brother after this.
Spring2016 You're right, I think. It really bothers me that he's happy to take money off my mum for a deposit for their house, for several mortgage payments that they couldn't make despite both working full time, but when it comes to doing something to keep my mum happy, he won't do it.
My in-laws are lovely and absolutely won't judge me, but I know they'll feel sad. They were looking forward to welcoming what they see as a new son. Of course it's not my or my brother's culture, and it's my choice to marry into this culture, but it is an attitude that I share.
Sigh. Maybe it's just time to call it quits with him. I'm quite tired of sending presents that aren't acknowledged, emails that are ignored. I have tried my best for the past few years, I don't fight with him these days at all and try to keep things pleasant, but I guess he's made his feelings clear.
Thanks again for the replies.