Would you go to your nieces birthday party if you and her dad don't talk to each other?

So me and my husband don't speak to my sister's husband for reasons that are too long to explain but basically the guy is a jerk he cheated on my sister and she decided to stay with him but that's a different story. He also doesn't get along with my parents so it's not only with me and my husband. So my sister is throwing her baby girl a 1st birthday party at chuck e cheese and I don't know what to do if I should go or not (i also have a 3 and 1 year old) My husband is definitely not going but my mom says I should go that I shouldn't care...I don't know my sister's husband's family is also gonna be there and it's just gonna feel awkard I mean they must not like me since I don't speak to their brother (he has 2 sisters) so I don't know what should I do???
 
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