I need advice about sister and best friend

So my best friend birthday is on July 3rd and so is my little sister who is turning 9!

My best friend is throwing a party and I know my mom isn't going to watch my kids on my sister bday and I know my husband is going to feel some type of way if I go to a party for 1 (which I really don't feel comfortable going because I'm married and I just dont do parties) and 2 he'll be home with the kids while I'm at a party!

I have never really spent time with my best friend on her birthday because of my little sister!

I'm so lost on what I should do. I dont want to hurt anybody feelings.

Please no rude comments.

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