We do not choose our family. For all sorts of reasons, and none at all, some members of a family do not want to keep in contact with other members and act like your brother.
All you can do is accept that he is not interested in keeping contact with you, that he has no interest in what you and your family are up to and just get on with your life.
Send Christmas cards and birthday cards, perhaps with a few words of news and then get on with your life. Enjoy the ccompany of your immediate family and cease struggling fornthe unattainable.
This happens in most families. there is a relation, sometimes, close, like your brother, sometimes a bit more distance, who quite simply casts off, and gets on with their life with no interest in any relations. not estrangement, just simply lack of interest.
Sadl, you must accept this.