AITA for telling my fiancée I won’t pay for her dad’s surgery with my inheritance?

I’m 30 and I recently lost my grandfather. He left me a sizable inheritance, just over $140K. I was extremely close to him growing up, and he made it clear over the years that he wanted the money to help me start a family, buy a house, or build something of my own.

My fiancée who’s 26 and I have been together for four years and engaged for one. A few weeks ago, her father was diagnosed with a heart condition that needs surgery. He doesn’t have insurance, and the cost is expected to be between $60–70K.

She came to me and asked if I’d be willing to use part of the inheritance to cover it. I told her I was really sorry, but I couldn’t. My grandfather worked his whole life for that money, and I don’t think he’d be okay with it going to something outside the family like this. I also worry that spending half of it means risking the plans we already made — like buying a home and starting a business I’ve been preparing for.

She was crushed and said she didn’t expect me to say no. She told me I “put a dead man’s wishes over a living person’s life.” That really hurt. I said it wasn’t that simple this was money meant to give us a future, not fix an emergency we had no control over.

Her mom called me selfish. Some of our mutual friends said they could understand both sides, but that if I really loved her, I’d help save her father.

Now she’s barely speaking to me, and I feel awful. I never wanted to choose between money and someone’s health. But I also feel like it’s unfair to be pressured into spending something that wasn’t meant for that.

So… AITA for saying no?