I’m getting married soon, and my sister lives across the country. We have a somewhat strained relationship because she’s very vocal about expecting others to cater to her needs. She’s told me she won’t attend my wedding unless I cover her flight and hotel expenses. While I understand that it’s a big event, I don't think I should have to pay for her travel. It feels like blackmail. I’ve politely explained this to her, but she insists I’m being unreasonable. Now, I feel like if I don’t invite her, she’ll hold a grudge. AITA?