Try to build up the confidence of your family members.After that tell him/her what support will you provide.
My daughters husband is a drug addict and refuses to let the children spend the night and drive with him..His brother is a police officer and keeps getting him out of trouble also.Now they are arguing with my daughter because they have a warrant out for child support and they are all mad. They are even starting to treating me and my family mean. My son who is in the fire department with the police officer he is finding faught with him. We need a letter asking them to back off.