It's a LOT harder today for young adults to get started on their own - I read an article not too long ago about a new trend developing in the 20-something demographic of staying home until you get married/move in with a bf/gf, simply because it takes the combined income of both you and your partner to afford anything. Either that or live in a commune/flatshare and then go home every weekend to get your laundry done and make up for a week's worth of starvation.
Transition can only make this sort of thing way worse.
I'm 29, and I still talk to my mom every week. Granted, we're in different countries, but Skype likes me alot. I think I'm probably their best customer. (my folks don't have broadband, so I phone their landline ... ouch) Our relationship has kinda evolved into a friendship rather than a mother-daughter type thing (we've both made a conscious effort at this after a very bad patch in my very early 20's), and I discuss stuff with her that would make people's ears bleed. She does too. My dad is a different story, but we're working on it.
That said, I can entirely relate to what Deniz says. Like all the other people in my life that aren't trans, my folks just cannot relate - it's entirely foreign to them, and while they support me completely, they can be very oblivious at times. My Dad especially still has a very definite - "there are maybe other options to explore" in his mind. Which I understand - He's losing his first-born son, I suppose.
Don't be too quick to judge us younger bunch for not striking out on our own as readily as we'd like to. The economic and social realities of our time make it a different place to grow up in. It'll be the same type of situation when/if we have grown kids one day. Hopefully we can remember that the only constant in life is change.