I dont see it as being to much of an issue i would rather affectionate children then ones who beat each other up just because they are boys.. yk?

also telling your bro he can get his licence is wrong. in SA he has to be 16 to get his L's so you freaked him out for no reason. I also know MANY people who dont drive because it scares them it isnt a MUST have in life.

peeing on the seats well many men still can not get that under control. how many women complain about the lack of toilet seats going down when they are married. Lots of Normal behaviours but i think you may be comparing them to your DH who may be really well "trained".

unless its a problem for THEM or your mum then they should do something, if not then just relax let them be who they are.