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Unfortunately, you are dealing with a serious allegation, even though it may be false, and spiteful parents particularly do this on a weekend so your son cannot exercise his legal rights and get an attorney to get to court and get the child returned until Monday. Even you as a grandparent cannot do much in the way of asking the social worker for a family placement until the allegations are resolved until Monday.
However, on Monday, two things need to happen if you want to resolve this quick as possible. First, you need to get your son an attorney, because DSS social workers are generally grossly negligent and incompetent and they exercise their own personal bias and personal agenda, regardless of what is best for the child and the only way to minimize this is when a parent has an attorney. Social workers hate it when parents get an attorney and try to discourage it because they cannot abuse the parent's rights when an attorney is involved and they cannot fabricate evidence or tell parents one thing and do something else.
Second thing you need to do is you need to contact the social worker and explain that the mother
has a boyfriend live in and you know nothing about his backgrounds and try to get the social worker to agree to placing the child with you as family with the guarantee that you will not let your son in your home or around the child until this matter is cleared (this is the only way they would agree to the family placement).