How to protect from false complaints by women

One of my Friend's wife wants separation, but she want him to leave her and children and pay maintenance. are having two boy child. and she don't want him to get custody at age of 8. she is raising false complaints against him at police station, like , also filed case with following charges 1) domestic violence, dowry harassments 2) tries to kidnap the children 3) stole her jewel the issue started when her wife gave 8 L( loan money from bank) to her father without his consent. when he asked to repay, they refused to pay. so he filed case against his father, to make him withdraw the case she is doing this. he even ready for compromise but she want separation and that to he should give, should register the Flat to her, and he has to pay home loan , personal loan and maintenance(too much for him). she is a workingwoman earning more than him so if she keeps on doing this how can he protect himself from false police complaints. is she eligible for maintenance first of all?