Should I tell my friend what her late grandad did to me as a child?

When I was 5, I was playing outside and I saw a bird laying there. I wanted to step on it, my dad's uncle rubbed towards me drunk and hit me on the neck. I went home crying and my dad stormed out and I don't know what he told him.

The uncle now passed away 2 years back and I still hold grudge. I hate him and I talk to his granddaughter who I am on good terms with. Should I tell her what her grandad did to me and that I hated him?

Should I tell my friend what her late grandad did to me as a child?
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