I'm assuming you are in the UK. How an earth is it going to cost you £2,500 just to attend a wedding in Ibiza?

You can get return flights for less than £100 and you only need to stay a few nights at most. Get a cheap-o gift, if the stag do is expensive offer to take your bro out for a drink instead, and just do your duty by turning up and leave it at that.

If he's not going to your engagement party I find it hard to believe he cares that much about the importance of marriage. Getting mad that you won't spends thousands of pounds on his wedding is completely unacceptable. You live on benefits!

I'm not entirely sure why your brother's wedding is all that relevant to you having a child. Surely your fiance can be pregnant and also go to a party? I am ignorant about the whole pregnancy thing but that kind of sounds like you finding a reason to get annoyed with him.

As for the engagement party. Is your brother clear that it's a big deal? I've never known anyone to have one before and I'd kind of assume it's kind of a minor get-together. Then again maybe he had one as well.

If it really is important to you and it really shouldn't be a problem for him to get there, then surely talking to him should suffice?