Hi Ilse. It sounds like your husband is being subjected to an employer's own anti-nepotism policy. While nepotism is generally not illegal, some employers, especially government employers, have rules or even laws prohibiting hiring of relatives. That's because sometimes relatives take advantage and hire their no-account nephew, their drop-out daughter, or their burn-out uncle. Other employers have more specific anti-nepotism policies saying employees cannot hire or supervise their relatives.
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