Partiality in the family and emotional abuse

I got married last year.We had some misunderstanding with my sister in law(my husband's sister)and we have nt wanted her to attend our marriage.My hubby's bro promised my hubby dat "let her come n attend our marriage n after marriage we all will break all relationship with my hubby's sister n my hubby agreed.My hubby's bro's marriage also took place on the same day along with our marriage.My hubby's bro did nt keep his promise of leaving contact with his sis.My hubby asked him why he is doing like that n he replied saying " if u didn't want our sister to attend marriage u could have done ur marriage separately".My sis in law,bro in law,co- sis make me feel excluded frm family.On my wedding day my sis in law indirectly insulted us.We r deeply hurt by their actions.I feel depressed bcz of them.We feel like cheated by my hubby's bro bcz of him we could nt b happy on our wedding.He married to below 18 girl,created fake marriage certificate changing marriage date.Is der any legal ways?