Is it normal to cuddle with your brother?
Depends.It depends
Yes, cuddling with your brother can be a normal way to show family affection. It depends on what feels comfortable to both of you and the boundaries you each want.
Lots of siblings cuddle, whether it’s a quick hug on the couch or leaning on each other during a movie. Families vary, though: some are very physically affectionate, while others show closeness in different ways.
The main thing is that you both feel comfortable and can say no or move away without it becoming a big deal. If it’s welcome and platonic, there’s nothing inherently weird about it.