Family party - not sure how to handle this.

[HHN]

So my youngest sister is throwing a birthday party for her 2 year old the whole family is invited. I have had a falling out with my oldest sister and we haven’t spoken for about a year I just avoid her at all costs. First family party since the fall out what do I do? Not go to the party? Or just go and avoid her. I can’t stand her I really don’t want to be around her but I feel bad not going because I adore my niece and my children adore there cousin.

Go and avoid her as much as possible and be civil if you are thrown together.
You can always make the excuse of needing to sort something out for your children to get away from her.

Go! The children shouldn't miss out on the celebration due to a falling out, plenty of people and distractions from children to avoid her.
I can just suggest though if it's becoming too much just politely leave before another falling out? Just so the birthday girl doesn't have a dark cloud over her special day

Go. Don't cut your nose off to spite your face. It's you who will miss out.

You’re right it will be me who misses out. I just wish it was over already I can’t stand to be around her and her fakeness

I had a similar situation recently.
Eldest brother and I fell out about 18 months ago. A year or so later we got an invitation to his son/my nephew's wedding.
We went, all prepared to be civil at most to DBro. Actually what happened was that he apologised for being a dick.

I assume your younger sister knows about the falling out? I’d go, but just avoid her as much as possible and don’t make a scene.

If this is just a personality clash rather than her having done something terrible to you, I think you should try and rise above it for everyone’s sake. It’s not really that difficult to be polite but distant.