Ludi,
I'm in much the same situation. My mom discounts the entire thought of peak oil (they'll think of something, she says). Dad accepts it in theory, but I think he thinks that this is a problem we'll have to deal with in the "future" - some far off date. My sister (single mother of a three - 5, 2, and 1 year old) is a complete airhead when it comes to thinking of anything beyond next week, and my brother & his wife are up to their ears in debt. They have a 19 year old and a 17 year old. I worry about these two kids more than anyone - and no, they don't have a clue.
The one thing that might make my situation better is that all but my brother's family lives on the same 160 acres of family land. My brother is in town - a house on a decent sized lot about 10 miles from here. If push came to shove, family could provide room, as both my parents and I have spare bedrooms.
However I worry about them all the time. Today I was babysitting my 15 month old neice, and reading the DOE's report (referenced in another thread) that I'd printed off. I looked up to see my neice playing with her plastic electronic piano, drinking out of a plastic sippy cup, and eating store bought cookies (all of which her mother purchased). I thought, this child is going to have to learn to make a lot of adjustments in her lifetime.
I can't fix everything, but I'm doing what I can. I ride my sister constantly about the need to budget better, and learn to cook from scratch, etc. etc. I may not be able to change her, but I can do a lot with the kids. My 5 year old nephew and my 2 year old nephew were out helping me last week to pick up some rocks from my garden spot. Last year, Ethan (the 5 year old) helped in the garden a lot. He became a pretty good cucumber picker

. My point is, I'm trying to teach her children by example to be more frugal, and learn skills that will help them as they grow older.
My brother and his wife, after seeing our success in gardening, have planted a garden last year. This year, he actually cut some limbs out of a tree to provide some more sun on their lot, so they could expand the garden. They did some water bath canning last year, and my sister in law asked me to help her locate a good used pressure canner last summer - which I did. She plans to learn to pressure can this summer, and I'll be helping her. They're also trying to pay down their debt, and are considering moving out onto the family land as well (they say in a couple years).
Mom and dad have decided to order some fruit trees and grapes. They've started buying a few things in larger quantities, but not a lot. They're trying to build back their savings.
Now, are they doing these things because of Peak Oil? No. They're doing it because they've seen how much we've gotten out of building our level of preparedness, both in terms of finances and quality of life, and because it makes economic sense to them.
They will in no way be fully prepared. I doubt any of us will be as prepared as we would like to be. But any small step I can get them to take now, will mean that they'll be more able to deal with things that happen as this unfolds. We're building infrastructure to be able to weather this better - both in terms of skills needed and land improvements made. They don't need to accept Peak Oil right now in order to see the benefit of being more self-reliant. As long as they're doing something - anything - to be less dependent, they'll be in better shape than those who are doing nothing.
So, any bit of self-reliance I can help them learn or begin to practice, regardless of their motives, is what I can do. And that's what I am doing. Hopefully, they'll begin to understand the concept of PO, but even if they don't at least they won't be so blind-sided when the slide starts getting more slippery.
Kathy