They feel they should be part of their family but often they can feel like an outsider in their own family. They can feel like a stranger in their own house. They feel they are merely tolerated by their own children and wife.
It can be that as the working man, they are away for work so often that they are seen as an outsider by their family. Their wife and children form a block together and he is just someone hanging at the edge of the family. That feels unjust to him as he feels he should be central to the family. He is bringing in the money, he is caring for the family so that everything is there for their survival and yet he feels like an outsider, as if he is not really accepted by them.
Be normal, have to be normal, desire to be normal.