Ok, I have joined today hoping that you good people can advise a non muslim of my sisters behaviour. I have deep respect for you all. I come from a mixed race marriage. My Father is a practising muslim and my mother is British and converted to islam.

A few years ago my father took a second wife in his country of origin. He did not speak to my mother about this - she found out the hard way. Anyway, now she lives with this and has come to accep this. None of us will ever meet the second wife, she is still in his country of origin and shall remain there.

My youngest sister has had difficulty accepting this. She has tried to influence my mother about his behaviour, this is wrong, she is a pracising muslim and should accept the decisions of her parents (or so I was led to believe). She caused some problems between them.

For one year I tried to support my sister through her difficulties. Then she stopped calling me and her mother - and no longer wanted to see her father. She stopped calling and visiting. I made efforts to take her children to see their grandparents. She allowed this but still wouldn't visit her mother.

After one year of this behaviour I began to get angry - I have done nothing wrong neither has her mother. I told her it was wrong and that she should visit her mother who is ill after sufferering three strokes. She refused. Now it is eight months ago since we have seen or spoken to her. She has had another child but only informed her mother after two weeks of the birth. My mother has never seen the grandchild. When she tries to phone her she makes excuses that she is busy and can't speak.

As muslims - can you tell me if this behaviour is right and acceptable? Thank you.