Dear Tate, my heart aches when I read of the death of your son. How heartbreaking. You have gone through enough genuine trauma to have your pain compounded by your husband's family. It is time to eliminate the gossiping, back-biting, and hateful drama that surrounds your in-laws. You have served your time in their pit - 15 years is long enough!
One of the best ways to protect yourself is to opt out of second-hand reports about what these characters are saying. That means if your sister-in-law starts telling you what her mother said about you, tell her "Please, I don't want to hear this." Treat yourself kindly. Don't listen to the tales of the in-laws' lies and twisted opinions about you. If you refuse to listen to this talk, you will remove a lot of hurt and stress from your heart.
Your in-laws want you to write a list of everything they did wrong? Oh, pleeez....TATE, DON'T PLAY THEIR GAME! DON'T FEED THAT FIRE! Let your response be simple; write them, "I must be treated with kindness and respect." Period. No kindness? No respect? No relationship.
Your strength must come from a husband who supports you. Your letter does not say much about the role your husband has in his family's drama. You also do not say how close, geographically, his family is to you. Do you visit them often of is their poison phoned in?
I believe you are soon going to be able to filter out the hurtful noise and feel a lot more powerful as a woman, mother, and wife. You can set some healthy standards.
I'm rooting for you.