“ Informal child care is when a friend, relative, or nanny cares for a child in the family home or in his or her own home, receives no compensation of any kind for providing care, or provides care for less than 20 hours per month.
Formal child care includes child care centers and family child care homes. OCC has standards for these facilities to be licensed or registered. Providers who are not licensed or registered are offering illegal and potentially dangerous child care.”
https://earlychildhood.marylandpublicschools.org/child-care-providers/office-child-care
Nannies do not have to be licensed to care for a child in their own home. The host child in a share is fine. The other child is the issue, and that makes it an unlicensed home daycare, per Maryland government. I think that makes it pretty clear.