What you're describing sound more like relief than happyness.
I felt somewhat similar when my dad died. He was drinking and declining mentally. Of course it saddened me, but with us having our first born at the same time, it was also a huge relief not having to deal with his issues in that situation.
My friend's grandfather had a pyramid in their garden. Not a big stone one, but more like 4 sticks in the ground. He would take naps in the pyramid hoping to cure his cancer. It didn't work.