Sloshim (idk how its spelled)

ok so my grandfather recently died, but I don’t really know how to process it. He was a not a very pleasant person to be around and my father is basically the only person actually grieving for him, my uncle only accompanied him in the shivah to support him. He lived in Mexico, and all of us in the states, so I didn’t see him too often but it’s still weird to me I guess it isn’t ‘real’ in my brain yet. I do hold some nice memories of him but I wouldn’t define the time we spent together as particularly pleasant, so I don’t really know how to feel about it or how to process it.