are they wrong or me?

my stepdaughter had a baby shower and nobody of my husband's kids (they are already teenagers) did not invite me to the baby shower. should i be part of the family too. at least could drop a gift to her or something. cause they don't want me to be close with their mom. BUT they want my son to go to the ex house...how come if they don't want me to be part of my future to be born step granddaughter. what do you guys think? i don't mind if my son goes there but they don't want me be part of step granddaughter. i never thought i would be a stepgrandma lol 😍