Relatives are still close, so it's unreasonable not to send them!

Generally speaking, the younger brother knows the wedding time of his younger brother and son, so he naturally wants to attend the wedding. It's not about inviting or not.

Of course, if your home is out of town, it's no problem to go to your brother's place, and he didn't invite you. This is your brother's understanding, and you can entrust other relatives to bring gifts.