Your body is infused with the world, energy is never destroyed, it is transferred. So technically when you die, your heat is radiating from your body into the wind, your body is absorbed by nature/trees/soil(If you were not buried, coffined, etc.), when it is absorbed by the trees, it is given off into the air, which is in turn inhaled by other people, the people who last touched you absorbed a good amount of heat... So when they touched other people their heat was absorbed, the heat is not always retained so it is given off into the air as well and the ground, etc. I think it's pretty cool that humans are like computers, they generate enough heat to make some eggs and bacon for breakfast.
Your genes are also given to your children, so half of you l"ives" on with in them along with other genes. Ever heard of the term, "You're just like your mother/father" that's because of heredity. So in that, they "live" on with in you.
So yes, everyone who has died is with us. What you take from nature, you must give back, the energy is not yours to keep.
This is not spiritual, I'm just talking about what happens to your energy, genes, body, etc.
From a spiritual stand point, you go to some sanctum which is defined by your religious beliefs or personal beliefs. All religion is based upon a reward and consequence system. So you either go to the Dark or Light side or in between.
Straight up what happens after death is... You cease to exist, your neurons rot and die like other cells so there is no possible way for that conscience to be transferred to another person or living thing.
Yes, I took this seriously.