Have I done the right thing?

Dear Agingcare friends,
I am sorry that I disappeared for the past week. My very dysfunctional family struck again. My older sister lives 8 hours away. She became very good friends with my young sister-in-law during my father's illness. My little brother joined them. I have been amazed at my 63 year old sister's ability to tattle, twist information, and start trouble. She never had children and is jealous because I did. I am sorry for her in a way, but I strongly feel that she would have become a narcissistic mother. She acted that way as my sister. The latest incident was the last as far as I am concerned.My father will have been dead for 2 years on July 17. Mother, in the custom of her church, ordered the flowers for the closest Sunday. She also asked my son, who is a music major and is a music worship leader at 20 years old in a small church, to sing and play that Sunday.He led the music at my father's memorial service. My sister sounded very offended when she and I discussed her visit on that Sunday and my son's involvement. I offered for her to sing instead. She made the polite Southern comment indicating that Adam should play and sing. Within two days, she had taken my comment that our family didn't want to offend anyone, involved my younger brother, and started major drama. I promised my father to keep the peace as he was dying. I can't. There is just too much baggage floating around our family with siblings born in the 1940's, 1950's, and 1960's. Plus my mother had a traumatic brain injury four years ago and cannot remember certain events at certain times. To top it off, my older brother who is a doctor, did not follow my father's DNR and tried to control his treatment during his 8 month illness. The hospitals Dad was in complained constantly and finally came to me because they considered my brother's behavior unethical. I am a special education teacher and was not afraid to do whatever was necessary for Dad. We are still fractured due to this, and my brother's license has been temporarily lapsed. I have decided to remove myself from my siblings. I am the only child that lives near mother, and I check on her daily, However,I have arranged for any texts or phone calls from my older sister and youngest brother to be blocked. I have left my phone open to my brother, the doctor, in case there is an issue with mother.My husband, son, and I have arranged for books to be donated in my father's memory for that day, and my son will offer to play and sing earlier in the month. We will arrange to be out of town for a graduate school tour and audition during the weekend that the rest of the family is there. My youngest brother is furious with me and my sister is haughty and wants to be in control. I have always had a different lifestyle from theirs. My husband and I are teachers and my son has played several instruments since a very young age in many different orchestras, trios, etc. We don't criticize their lifestyle choices, They don't like ours. My husband and son just cannot deal with the drama and the fact it upsets me. Is this the wrong attitude to take? My mother will not understand if I try to explain even though this is about the 15th major incident in less than two years. I will have contact with her, but will avoid contact with my siblings. I think the doctors gave my mother the wrong child at the hospital. :) I do not fit in and never have.