That's a very generous offer if legit and definitely not typical of what you see on trading sights.
That said, since it goes against the norm, you really should give a more detailed intro about yourself. At best you are a generous soul looking to help others- at worst this is prelude to just another scam. Answering the following questions would be helpful to most:
1) Most successful traders have spent a considerable amount time, blood, sweat, and tears coming up with a working trading plan. As such, they are loathe to reveal their hard learned info to the general public for fear of compromising their system.
Do you not have this concern?
2) You're at the prime age for earning and have a family. What would be your motivation for basically working for free which takes time from pursuing other venture/activities allowed by financial independence?
3) What is your performance history? Offering to mentor comes with the presumption that you are a successful trader. What have you traded, what is you time frame and profit/loss ratios? How long have you been successful? Are you a long term, swing, or intraday trader?
4) What is your prime motivation for free mentoring?
5) Why not just post your system/methodology online if you don't mind sharing with others?