I screwed up!! Advice please?

I fully understand I should have sent someone to inspect it.
The seller talked me out of that so to speak. “My brother does inspection for —————, high end muscle and classic cars ect” save yourself some money in the inspection he said, no one can give you more information than I can. .

I wouldn't ever trust a family member to do an 'honest' inspection of a car that their relative is selling... Who's side do you think he's going to be on????