it's not weird but it's also not weird if he isn't into it. amongst my own friend group there's some with siblings or cousins who come along to the pub etc but there's also others who keep their friends compartmentalised, who keep in touch with school friends, work friends, family members, whatever groups entirely seperately
so ask, you have nothing to lose, but don't take it personally if he doesn't like the idea
it's not weird but it's also not weird if he isn't into it. amongst my own friend group there's some with siblings or cousins who come along to the pub etc but there's also others who keep their friends compartmentalised, who keep in touch with school friends, work friends, family members, whatever groups entirely seperately
so ask, you have nothing to lose, but don't take it personally if he doesn't like the idea