Treat them like you handle anyone else: with respect and with kindness.
Don't assume evil intentions when you can assume ignorance. Teach people how to behave and how you expect contributions instead of berating them. Lead by (good) example. Tell people that you will have an open ear and are willing to listen, if they have any issues concerning behaviour or proceedings in your community.
If you are willing to mentor her/him and give special introductions and advice: then by all means do so - if s/he wants it. Teach the ropes as far as they are willing to go, as far as desirable and necessary. Do that via the usual platforms you employ in your community. Give them things like 'good first issue' to work on to get a feel how it goes, to enable success stories for them and learn it by doing actual work.