We are all social creatures. We feel the happiest when we are with someone or group of people. An introverted person might not agree but deep inside, he/she knows. I'm glad your brother found his wife, which brought a new feeling of belonging to something superb. Some people don't find it, and live on sad and lonely. Socialising is super important and necessary to keep our mental health at a good condition.
I'm super excited seeing your comment on my article. I'm honored.