If they talked freely to you about rats and punishment, the fmom and cw are probably well aware of those issues.
I would still tell the fmom. She'd be able to tell you if that was something the cw already knew about. If the fmom DID NOT know about those issues, then I would ask if she would mind if I called their cw and informed them of the particulars of that conversation.
As a fmom, I would want to know some details as far as behaviors, discipline, food, etc.
It's great getting NO information isn't it?

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Robbin
Mom to:
MK(29)
TM (19)
EM (15)
Stepmom to EP(16)
Foster to Adopt Mom to FL(16)
GL(10)
ECP(7)
Nanny to NK (5)
Homeschooling EM, EP, & FL
Fostered: J7,N11,M12,S13mo

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M4,K8,F13,R8,T9,L3