It would be either through the courts, after the suspicion was raised by someone who knew them...or someone working in the children's school, reading this very post.
That's all I could think of.
His children are very young. 3+ years and 17 months. Do you mean like daycare?
Well, I really doubt that anybody will "tell" on Michael while he's got a judge in his back pocket.....but, if the tide begins to turn against them both....then perhaps lots will come forward with who knows what.