My friend is married to a man with four teenage children. They love each other and have created a very close knit family with husband's children, (three of the children at least), two of who are girls and love her very much. They see and treat her as their mum. But the problem is with the eldest child, the young man who has refused to accept my friend. He is not rude or outwardly hostile, but he is very cold, and distant himself from any family affairs that involves my friend as much as he can. A veiled hostility so to say. My friend initially thought he was just a bit different in easily coming to terms with the new addition to the family, but a few years on now, and his hostility still remains. All the children still live at home with their dad and my friend, while this young man and the older girl, are away in university most of the time. But during holidays when they're all at home, the eldest boy creates an atmosphere with his veiled hostility that my friend is worried might start to influence the rest children negatively. She loves them all as they are very great children and would love more than anything for the young man to love and treat her like the other three does. What can she do about this situation?