My father is in illegal relationship

Hi sir, my father is in illegal relationships. Actually 1st time he got married (love marriage). Then later we don't know what happened but in the presence of family members they got divorce then later married my mother. Even after marriage till date he is relationship with her but there's no difference after getting divorce with the 1st person (she is like a wife only). Later found with so many other women's.... And still now he is 50 years above, I found him with 1st married women's brother's wife. These many days we saw all the dangerous fightings between my mother and father we use to think that these fight is because of the 1st marriage. I don't want to be in this because we don't have any happiness here. Only the thing coming from my father's mouth is saying everything I am spending for you. Every thing I am spending for you people. But spending thousands of thousands of rupees to the other women. I also have an evidence regarding the last women's. What to do with this situation now...