That just makes it seem that the relative was making tons of money and made a "dumb" mistake
I am confident that any 10 year old could sell $100k+ per month online with about a week of training if that was the only requirement and they were allowed to spend $120k. Actually earning significant profits is the difficulty here, and that only gets easier with the standard toolkit of running a successful online retail business: understanding the products, knowing the market, and understanding all the legal hurdles.
This 10 year old sounds like they're ready for the next YC batch lol.