Quote Quoting sedaiv
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My story is going to center around a man who finds a homeless child...
How old?
Quote Quoting sedaiv
...no parent or guardian to care for them...
Why not?
Quote Quoting sedaiv
...and takes them in...
Doing what to inform the legal authorities -- police and protective services -- about the situation?

You can do a lot of imaginary stuff in a story, but if you want to prevent a story with a degree of verisimilitude you're going to need to provide some details, and deal with or skirt the issues that would normally have the child taken into protective custody and placed with a licensed home or foster parent.