Immediate family members refer to people who have direct blood relationship or marriage relationship with themselves, such as father, mother, husband, wife, son, daughter, etc. Brothers and sisters are not within the immediate family.
It should be noted here that you have the obligation to inform first. If you don't tell me, it doesn't matter if the other person is not a caring person. If something happened to the other person's house recently, you learned from others that you went to the funeral before going to the other person's house, but you didn't say that the other person would throw all his grievances on you and think that you brought bad luck to others. You inadvertently offended a friend.
People's customs are deeply rooted and have formed laws over the years. Although this is not wrong from a scientific point of view, people's consciousness is to stay away from people who have funerals at home. Just understand each other. If there is a funeral at home, try not to go to a friend's house to avoid making people uncomfortable.