[MzHN]

For just hosting something as long as possible I would highlight two options stolen blatantly from previous threads:

If you can throw enough money at the problem and are in the US, set up a trust to host your content for as long as the funds last.

If not you could bet on The Internet Archive to outlive you (and maybe donate to them).

But I think the bigger issue than hosting is discoverability. How will your great grandchildren find your content even if it was still available?

To cover both issues the best bet is to focus on somehow convincing your offspring on keeping your content and memory alive in what ever way they see fit, enough so that they pass it on. I have no ideas for exact details here, maybe someone else does?

[apothegm]

The trust is the only truly perpetual answer so far.