What should I do with the body?

Suspending decorum and decency here for a minute.

If my son (age 5) should die before he wakes, do I HAVE to release custody of the body (apart from an autopsy if required)? Can I, say, keep him in the freezer or tan his hide & make a jacket or feed the body to the dogs (or eat it myself for that matter)?

These are disgusting options, but what is actually required of me, his parent when it comes to the body of MY family member?