Only place nepotism would be acceptable in my book is a privately owned company.....not in a public company and certainly not in the equivalent of the civil service or government.
Nepotism is rife in the UK government, with ministers and MP's employing a spouse daughter, son.......and in Bunter's case, if he had got away with it, his lover (recently invited to leave her employment with the Tory party having fiddled her expenses)