He should have proved Pia to be unstable, crazy. That would easily take care of taking away custody of kids to Pia. He has already proved his wife to be mad. He could have hatched similar plan for Pia just like bani. WIth his power money & evdences he could have proved Pia crazy & unfit for custody. he could have keot kids some where for the time being.Mad sister ,suicidal mother would help to prove heridity inaddition to tapes of her dialogues to prove OCD would make it easy.
Oh well I hope bnai does that soon so that Pia can't use her trump card..