DP's parents: probably continue in same vein - still sends him money (even though he's 40, has a family of his own, and a stable-ish, decent job). His Dad pays for family holidays, so that we can all spend a week together once a year. Once when we had an emormous row, DP phoned them and they dropped everything and drove 2hrs to make sure he was alright. Whenever we go over for a visit - his mum still brings him cups of tea in bed. As we have children, they have somewhat shifted their focus to their grandkids now, but seem to repeat their family dynamics with our children, i.e. DP was PFB, his younger brother was always labelled as 'the naughty/stubborn/awkward one, and now MIL talks of our DD1 (age 4) as 'a lovely, lovely child', and said of DD2 (age 2) as 'I think you'll have problems with that one'.
DP: Left home at 17 for uni. His parents made sure he got accommodation that was catered for, so he didn't even have to cook for himself. Unfortunately it was also located miles away from the city centre and in a post-retirement area that was boring as hell. He left for a more thriving studenty area after a term, discovered a social life, found some friends, and never looked back. He's quite a rounded person now - fairly responsible, great Dad, shops, cooks, does his own laundry and ironing, etc. and can look after himself a bit. But still crap with money and finances, and I would say sometimes behaves thoughtlessly, like the world revolves around him, even though he's a decent bloke. Has said he could never, ever live with his parents again these days, without going nuts.
BIL: Found partner and got married - seemed fine at first but split with wife when baby was 6mths. Moved back home to live with parents, and has been there ever since - his DD is now 10. His Mum does his washing and tidies his room, his Dad does most of the cooking. When his DD goes to stay with him, his Mum ends up doing a lot of the childcare, if she's around. But the arrangement seems to suit them all, so...[shrugs]