Massallah peratining to forgiving of ones mother and sister in law

salaams muftishab,im married 3years now my lifes a rollercoaster iv had countless problems with my mum n sis in law,i just cant seem to find it in my heart to forget all the nasty things they did,hw can i find peace at heart.alhumdulila allah has given her everything bt every time i look at her all the things she did comes back to me.im only human i have forgiven her @ mum but just cant get over what they did to me.am i a bad muslim for bein this way?y is it that people make their daughter lifes easy @ yet make their daughter in law lif dificulty.y is it when u give ur heart to the family that u married in only to find out that all wat u have done means nothing and yet u still continue just so u want to see ur husband smiling.hw do u forget that cos of da the mum n sis in law ur mariage was goin to end?and 2day when there daughter is married they given her a comfortable life yet they made urz a hell?n hw can u forget that even tho u married and have a partner but you were always a lon