Had similar with the kids of several clients ---- Moved onus off me (keeps parents happy too --- so they don't get "miffed" and try someone else) by bringing into the tax conversation that -- hey, you're out of school, working , doing your own thing now, making better money, etc.; which they agreed to ----
and then just saying, something like "yup, your really an adult now, so when would you like to go into adult mode with real life fees, it moves you from the "kid - (because of tying into your parents, etc. -- I DO MENTION that fact)" fee to approximately X dollars which is real adult world or actually a bit less, as we've been doing this for a bunch of years, etc.? I can do this year as kid fee and we can move you to adult side next year or would you like to move up now? Either way is OK with me"
Takes pressure off if they REALLY hadn't thought about it and saves them "face" if they did but were "using" my generously, etc.
Only had a few - wait till next year as most stepped right up and agreed they were adults now.
I hate to lose ANY clients I've had for more than a year, as originally I did my "weeding" the first year, if we didn't match or I wasn't willing to accept them, etc. Right now, I'm building but that was due to Medical - those that stayed with me, I'll actually "fight" to keep - they stepped up for me. About 7 of these are "kids" I did my "spill" with (parents stayed too).