30yr old daughter returned to marital home because of her 2 children after police restraining order (72hrs) against husband and his parents for years of domestic violence (some physical, mainly emotional especially by mother-in-law). Their son is now 10 and he, as far back as being a 4yr old, has informed that "Daddy shouts at Mummy, makes her cry and tells her she is stupid'..I have also witnessed incidents personally. She is an intelligent woman with a career and Post Grad degree, but has now been diagnosed with bi-polar (genetic from her father's side) and is unable to work..she is very aware of her illness. She only has myself and her brother for support in WA and the family initially managed to isolate her from us until she started threatening suicide...she is now seeing the appropriate help and is back in contact with me. Her husband (aided by his mother) have fostered the public persona of a mentally unbalanced woman who is not capable of looking after her children - without mentioning the continuing day-to-day abusive domestic situation ie: he has informed me that she is 'constantly defiant'!? without even realising what he has said.. He has now informed me that he may have to have her 'hospitalised involuntarily' for the sake of the children' and will sue for custody of children if necessary on the grounds of her mental incompetence. Do I, as her mother, have any rights to prevent him from going ahead with this should he try and carry it out?