Is OTHER wrong in the post ? POST : So I am part of a newly blended family. My father married my step mother 3 years ago and as such, we are celebrating Thanksgiving together. I \[23F\] and my sister \[28F\] have inherited two new step siblings \[29M\] \[32F\] whom are both married and one of which who has kids. I am the only one who lives in state. So everyone is traveling to our parents house for Thanksgiving. However, my sister and I have just been told that our aunt (our deceased mother's only sibling) and our grandmother (my father's mother) are not invited to Thanksgiving dinner. 

My sister and I obviously flipped out a bit since we have spent almost every Thanksgiving and Christmas with them. My dad has been playing mediator with my stepmother and my sister &amp; I. He says that her vision for Thanksgiving is one with only the "core family". This comes from her tumultuous relationships with her two kids, that has finally now calmed down a bit. We've been told that our aunt and grandma can come to the house after my stepmother's kids leave on Friday and that we would have another dinner. That doesn't seem good enough for me. So my sister and I have come to the agreement that if they are excluded that we would not attend Thanksgiving with them and instead have Thanksgiving with our aunt and grandmother instead. So WIBTA for boycotting dinner with my stepmother?