أنشئ حسابًا أو سجّل الدخول للانضمام إلى مجتمعك المهني.
It's not 'never': sometimes it's a very good idea.
However, it can give rise to a conflict of interest. Imagine a situation where a manager has to decide which of the team are to made redundant, during a cost cutting exercise. One of the possible people is a family member. This is not fair on anybody.