We need father like this....

Sir I am posting the data on behalf of my sister family. If husband maintaining illegal martial relationship with many girls on day today basis how the women can tolerate this. In earlier days my sis husband rejecting the allegations about the same. Now we have all eye witness, audio, video & photo proof but i am scared to put the evidence in front of my elders by thinking my sis future as she has two young children's which are under 12 yrs. Now please guide for whom I should contact ? Police, Lawyer, Psychiatrist, Family Councillor or My so called elders... Please guide me. Thanking you Sincerely