Translation:I miss my older brother very much, I want to cry.
I miss my older brother a lot. I wish he was here to punch Duo in the beak.
It seems the use of 想 here is the equivalent of English 'miss', but it really means 'I very much WANT (to see) my older brother' which means more or less the same thing although wanting is not missing. I guess you could say it's about wanting something you can't have, and that causes the missing.