People show so much curiosity about if this post was for himself/herself. For what ? Is that important for you ? This shows unhealthy mentality and psychology. Never ask so much or peek too much about others' privacy. Just express your opinion if you want to chip in. If not just walk away.
Now get to his/her question--- I don't think it is abnormal to keep some distance with co-workers in this country. In China long time ago people work together for few decades until they retire. They lived in the same community for decades sometimes. That was an old style. Here we change jobs and we all have private lives, religion, culture, etc so we don't get too close with co-workers. Plus, it make things get complicated if the coworkers relations are too close, that's why people intentionally choose to keep some private distance from co-workers. People make friends from other sources. What sources-- it is totally up to you. But if you feel your relative has no friend, the problem is not he can't make from co-workers, it is he can't make any from somewhere else. But even that, as long as he has a good family or personal life, you don't need to worry about him. Many people in this country are like that and they keep to themselves. It is totally normal as long as they don't behave weird.