What do you think of this as an explanation of behaviour?
Is it a reason for certain behaviours?
DH said it to me recently about DS1's actions towards his younger brother (he can be quite mean to him and DH said 'that's what brothers are like').
To be honest I really don't think it's a actual reason, and I certainly don't think that it means I shouldn't condone DS1's actions/words towards his little brother and just accept it.
DS1's behaviour isn't anything shocking, just saying things he knows winds DS2 up ("you're to little to do that", "I'm not playing with you because you're silly" and being really bossy or opting for the total opposite of what DS2 wants (regarding something such as which book to have read to them at night or which playground to go to). That sort of thing. Nothing to wildly unusual between siblings.
In a nutshell is it right to condone something because it's 'normal'.