[Stacey]

These types of situations can be really difficult. Ultimately, your brother's choices are his own, and you understand that, so this may just be one of those things where he has to learn on his own - whether that turns out for the best or not.

If you have a close relationship with your brother and are often open with your feelings, then you may be able to voice some of your thoughts on the situation in a delicate, compassionate way. If you have that type of relationship, voicing your concern for him as long as you make it clear that it's not you objecting or interfering with his decisions should be okay.

Ultimately, just try to be the supportive, positive sister that you already seem to be, especially if he's going to have to deal with the opposite from your mother. He's going to need someone in his corner.

While it can be hard to sit back and watch people make decisions like this, if they're adults they're going to need to make their own choices (and possibly mistakes) and learn from them.

When it comes to the travel part, I'm not sure on the safety overall, but from friends and family that have travelled there, certain major cities are completely safe for travellers. Just like anywhere new, brush up on common customs and do your best to be respectful to them. If you can't make it work to travel for his wedding, I'm sure that's something he's considered, it's a big ask. If you're unable to make it, perhaps suggest organizing a get-together with him, his then wife, and maybe other family/friends in the UK so you're all able to celebrate their marriage when they return.