Must my son speak with the police if they have called and want to question him?

Question Details: My husband received a call from the county sheriff's department looking for my son. They said there were allegations against him,and they wanted him to call them back. They would not tell us what the allegations are. We told our son but he has not called them back. They have called my husband a second time asking for our son to talk to them. First off, they are calling my husband's cell phone. Why would they call my husband's cell phone and not my son's cell phone? Does my son need to call them back? If so, should he ask for a lawyer? If he doesn't call back, will they arrest him? My son's exes call DSS,the cops, or whoever on him all the time. Even when he doesn't have his children. We have no idea what they could possibly want.

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