Should I look for my brother?

Hi So, my older brother was adopted out of the family after his father died, my mum was ill and we were completely broke so she wanted him to have a better life and opportunities. Since then we've been through a lot, I won't go into gory detail but it's worse than being a widowed mother at 25. Needless to say, what remains of my brothers birth family is a bit of a mess. I started looking for my brother when I was nine, I stopped a couple of years ago because I decided it would be completely selfish to try to bring him back to all ours problems. However this year my mother has became quite ill again, naturally I worry about the worse, I want her to know she made the right choice and she didn't mess up all her kids in case anything happens, but if conflicts with my previous decision. So do I find my brother or not?