u/Hot-Run-6323

I (25F) work from home, and have a flexible schedule, which has led some family members to assume I’m always available, so my sister (32F) who has two kids occasionally asks me to babysit her babies and I help most of the time, last week she came to me without notice to help babysit her babies while she attend a wedding, and this happens a day before she leaves, I couldn’t take it because I have lots of work to finish up so I have no reason but to decline to her offer, told her if she would have given me notice earlier I would have considered, She said she had already made arrangements based on me helping. Now she’s upset, saying I’m selfish for backing out, while other family members think I should cancel my plans to help her.