Who comes first fiance or siblings?

Help! I have been engaged to my fiance for half a year by now and i dont know what to do. my family is having a party in 2 weeks and my fiance is not invited due to some past incidents between him and my siblings. things were said that were not acceptable and conditions where made and expected to have been met by now. my fiance has completed half of the conditions but one thing could not be met due to recent health issues and personal issues. so now I am at this stand still of do i go to the party without him to make my family happy but my relationship suffers or do i not go and risk my family relationship suffering. i personally HATE confrontation and making people upset. this is not the first time my fiance was not included in something that involved my siblings and i feel the past should be the past especially when the entire family is getting together for a party. what should i do?

go to the party without fiance
not go to the party
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Who comes first fiance or siblings?
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