My friend suggested getting people to co sign my book so I can write it without an advanced degree, thoughts?

So my uncle has a PhD, my cousin has a PhD, and my cousin's partner has a PhD.

I could write the book myself, and then get one of my extended family members to co sign the book with their PhD and maybe pay them 5% of my book royalties to them to co sign the book.

That way I can publish self help books on social topics without a PhD. I did research online and my idea is superior to that of PhD medical doctors, because I've been studying my idea for over 20 years and a medical degree takes around 10 years to get.

My friend suggested getting people to co sign my book so I can write it without an advanced degree, thoughts?
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