I told my boss my grandfather died to get a few days off then he actually died about 2 weeks later
Do you think it would be best to tell the truth about how he actually died now?
Yes, I told them that I needed to carry my grandfathers coffin.
Needing a break from work is natural but it is not good to lie in order to get time off. You could have had a hard time getting time off when you really need it.
But I don't care; I wanted a bit of free time to play games and hang out with my friends.
Lying about death is not really the thing you should be lying about. While all lies are wrong, saying a family member of yours died is pretty dark. Death is just not something to joke about or make light of.