my sister and her husband is continuously fighting due to he having a affair with some other women he always speaking with him by mobile I don't know what do we already spoken with him along with both parents but he not honest if I complaint in police station they will take action to join the husband and wife
This type litigation s no one could solve .the remidy is both should have mutual understanding and respect if not take mutual consent divorce .if u go to police or court they will try to patch up which is useless and futureless.
Complaining to police will not help in joining them, however the situation will get worse. Try to amicably settle or go for divorce. Your sister can claim maintenance or lump sum settlement amount if she is eligible.