The Flint office of Legal Aid can be reached at (800) 339-9513. I'm telling you that because you need a lawyer.
Section 8, (Now the Housing Choice Voucher Program) requires that homes be free from "any condition that endangers the health and safety of the occupants, including lead-based paint."
You have described a situation that occurred in one of two ways. The first is that the landlord knew about the mold, disclosed and they did nothing about it. The other is that the landlord knew about the mold, and hid it.
What you need right now is help getting out of that place and into a new place that doesn't have mold. Then you need to consult a lawyer about sueing your landlord for endangering you and your children
Your first issue though, is removing yourself and children from that place. Contact legal aid. See if they can help you.
The information provided is based solely on the general information given and should not be construed as legal advice for your specific situation.