We're close to FI at 46 with two kids at home - 16 and 13. I do all the same things everyone else does: live below our means, invest what we can, etc. Do we travel as much? Nope. We're tied to the school schedule. Does my husband keep working for the health insurance and security? Yep. So if you're asking if we have RE'd, then, no. Could we? Yeah. But I've always liked RE as "recreational employment." FI for me is about security and knowing we could walk away if jobs got bad.
That being said, I'm trying to loosen up and enjoy our time with them more before they are out of the house. Planning some fun adventures.
A few things I do that have worked for me with regard to kids.
1) I talk about money. A lot. Especially with my oldest who wants to do ALL THE THINGS and buy ALL THE STUFF. I have talked about money with her from the time she was tiny. I've explained that if I don't buy the most expensive X, it means I have more money to send her to dance class. That if I use partially broken Y (that still functions) instead of throwing it away and buying another one, I can keep supporting our favorite charities.
2) I set up a Spend/Share/Save system. They get a very small monthly allowance ($4 less than their age. Arbitrary!) which they have to split into these categories. Allowance was to learn about money, not to pay for everything they wanted. They needed to earn extra money.
3) This year, she wanted to do competition dance. (EXPENSIVE!) I gave her my budget for her activities for the year, and she is paying for anything that goes over. We made a plan for her to pay me monthly.
4) Now that she's 16 and has a job, we made her an authorized user on a credit card. She can buy gas for her car and things I ask her to pick up from the store. She can also use the card to buy stuff she wants. I go through the statement every month, tally up her personal expenses, and she gets a credit card bill from Mom, which she has to pay.
She tells me her friends are clueless about money. She tries to tell them to stop buying so much useless crap. She tells them she already has a Roth IRA. (My idea, not hers, but she's glad it's there.) This Momma is so PROUD!
5) I set up a Roth IRA the second she started making money babysitting. I funded it myself (up to what she made or $500, whichever is least) and let her keep what she made.
6) I set up 529s years ago, saved a set amount in them for college.
7) Christmas and Birthday money went into High-Yield Savings from the time they were little. It is theirs, and it keeps growing. Could I have invested for higher returns? Yes. But I wanted their money to be completely secure, and I still have it under my name (for FAFSA purposes).
Hope you get something out of all of this!!