I'm so very empathetic to your loss of your mother. ((((((((((Quyrah)))))))).
I had a similar experience when my Mother died in 1991. My older brother was always the attention junkie, and liked to "rule the roost". He kept my two other brothers and me from our Mother's bedside as much as he possibly could, to the point that my Aunt SNEAKED me in to see my Mother one morning, while my brother left for a bit but she was already in a coma and could no longer communicate. I was a JW back then, but my family wasn't, so my brother hated me and the religion I was a part of, and decided I needed to be punished.
I was the only daughter, and it was tearing me to pieces to lose my Mother. There was only one or two JW's in the entire Kingdom Hall who even bothered to attend her funeral or wake. My father snickered at me the day of the funeral and said, "Where are all your good church friends, now?"
I was 35 years old. I should have told my brother off and went to be with my Mother anyway, but I was trying so hard not to make a scene. You did the right thing to go to your Mother, and to her funeral. Tell your little brother and his sicko wife to go to hell and stay there. They deserve to be written off. I've not spoken with my older brother in 17 years, and I figure I'm much better off. You probably will be, too.
Protect your heart, and your emotions. Don't let them get to you. You know you did the right thing.