I see my duty as ensuring ds reaches adulthood as a confident individual who can stand on his own two feet (as my parents did for my db and me).
He is 17 now and will be going to Uni in September. We will help him with student loans etc (in Scotland, so it's worth him taking out the loan as they aren't charged the silly interest rates that are charged in England, plus he doesn't gave to pay fees) and make sure he is not short.
After he graduates, he may well end up back at home for a short period I hope not - but I hope he'll have found a decent job and won't need to (the Uni he goes to has a good record for positive destinations, as does the specific subject he will be studying).
When I graduated, I got no help from my parents (even though they could have afforded it) - nor did I expect it. Admittedly, I studied in an era of free university education and student grants (although I only got the minimum grant, but my parents always made it up to the full amount expected) - but it was also the era of ultra high interest rates (base rates were 12+%). Rented initially and bought my first house flat in 1985 for c£25,000 (one bed flat in Hotchin) and was then moved North by my company a year or so later and had to sell it, buying a wee cottage in Bolton for c£35,000, with a mortgage of £30,000. Iirc, my monthly payments were in excess of £300/month
- which was a heck of a proportion of my take home pay (I can remember when standard income tax was 27%
- which actually I didn't mind as I saw that as a price worth paying for decent public services). I also rarely went out to pubs/night clubs and had to cut back holidays for a few years (even though I was relatively well paid). There were weeks when I only had £10 to spend on food
Fortunately (or not, depending on your viewpoint
), it was the era before mobile phones let alone smartphones so at least I didn't have that expense 
I very much supported my parents being "SKIN" parents ("Spending the Kids Inheritance Now"), as they went off on various exotic holidays after they retired early . Sadly, my mum had a bad accident on one of those (activity based) holidays from which she never fully recovered and died a few years later
But my dad is still travelling regularly and has a new (actually old - they'd known each other at Uni) lady friend which I think is brilliant. I wouldn't expect him to give up any part of his income or assets to help us - he's already (with my mum) given me the biggest gift of a great upbringing.
I'd hate to think that my dad might think I was judging him for still living in a nice house and not helping us out more
Ditto with ds: I hope he never complains that we are not downsizing so that he can then buy a house without saving for it himself. I doubt he will, as he's told us he "never wants us to sell the house as he loves it so much" (4 bedroom conversion, it half of a much larger house, with a large garden - over 3 floors so not actually that suitable for if/when dh and I become infirm in many years to come
).