I think the person is less important but the rationale for it is what really matters. Schools are looking for impact here so if your father truly fits the bill here then so be it. But make sure if you are going this route your rationale is clear and not an easy out. This is an opportunity to really give some insight into how you think and what you value so really think through this. I'm sure you will not be the only person who goes this route so make sure your execution stands out here.

Hope this helps!