Party

There is some ongoing conflict in my family due to my SIL and brother, SIL and I do not get along and we don’t communicate, differing personalities and overall I don’t agree with how she treats my brother and his child from his previous marriage. I’ve expressed my concerns to him but also recognize it’s his marriage and his life. Brother has decided to remove me from his life gradually within the last year per her wishes. I have always been involved with his children up until recently. We were not invited to my nieces 1st birthday party, their child together. My child was hurt by this because she was the only child who is immediate family that was not invited. Regardless, I view it as our differences as people should not affect the children’s relationships with eachother but clearly that is not the case. My parents were invited to the party and I sent a card with money for my niece with my parents. Was this wrong? I genuinely was not trying to be petty I was just sending a card like I always have for all the nieces and nephews birthdays, just this time without an invite to the party.