Do not forget me

If all goes according to plan, I will die before any of My Future Kids. I will therefore entrust them with the dealings of my death. The first thing: My Future Eldest is keeping my dead body in their home until it is to be disposed of. Hopefully it won't take very long. I shouldn't have any organs or anything, so I don't think it will be that bad. Let's say my dead body or what's left of it is going to be hanging out there for three days. During that time, my other offspring will trek to return to the homeland. They will stay with My Future Eldest and in during their time with my lifeless body, they will receive my instructions. These instructions will come in the form of a handy video which they will each  receive a copy of to view at their leisures.
The video will contain the following:
Instructions on how to deal with my body:
My Future Kids will deal with my body on their own. They will wash, dress, and take tasteless photos on their own. They will dig my grave by hand and they will place my cloth-wrapped body into the ground. First, however, they will cut off my right pinky finger, wrap it tightly, and bury it in a wooden box. They will record the location of this box and pass on the location to their own children.
Where to find all my secrets:
When I am old and no longer working and with oodles of free time, I will construct a puzzle hunt. At the end of this hunt, My Future Kids will find my secrets. But only if they prove themselves worthy. I will need to think of a good test of worthiness. I would like to think that by that time I will have plenty of good secrets that may only be revealed upon my passing. Oh, and at least one of my dark, dark secrets will be totally false. Amongst these secrets there will be a slip of paper with a hastily written place and date, 200 years into the future. I will scrawl something urgent-sounding, and beg that the place and date be saved by My Future Kids.
There's no better troll than a troll by a dead person. Awww yeaaaaaah