I believe you need to rethink the "reunion" and let your sister go to Hawaii with her husband. If you can arrange for all the others to get together either before or after and you can spring a surprise wedding on them at the same time, good for you.
If not, make this about your sister, not you. She's had 30 yrs of tough medical issues. If you can find some good fares, have a great time. I seriously doubt you can get any action here, nor any similar site.
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