My sister is hindu and the man she wants to marry is seikh. She totally abandoned us for him because he is a smooth talker . My father knew this man was no good for her but she refused to listen. He has taken hundreds of thousands of dollars from her to invest in ridiculous business schemes. He hangs with criminals. As of yesterday we just found out after 8 months of being with him he has had numerous affairs with women and now the last one is pregnant by him. Is there anything thing in the seikh prayer book we can point out to stop this wedding. He doesnt love her obviously. The union has destroyed our family not because of the religion but because of his dishonesty. She has no idea what he has been doing. We dont want to hurt her by telling her . What can we do someone please help us.