+1 to this. What if you need to fire your parent or spouse? Sure you might feel like you can do it, but for a whole lot of people the power dynamics and differentiating a personal relationship and professional one is tricky. I mean, I wouldn't write a blog post recommending this.

Couple quick scenarios come to mind:

"Why are you firing me?" "I need someone more qualified. You've done good work, It's not personal." "But I'm your mother. I changed your diapers and taught you right from wrong." ...

"Mom, my business failed. I have no money." "Well, you should have thought of that when you fired me." ...