Nephew's birthday money rant

For my nephews 10th birthday my husband and I gave him $50 in cash so that he could buy whatever he wanted or needed for school since he didn't really know what he wanted at the time. Last night he told us that there was something that he wanted to buy but couldn't so my husband told him to use his birthday money, and my nephew said that his mom spent it all on the entire family in a restaurant. I know that when you gift money you don't have control over how it's going to spent, but it was meant to be just for him so that he could buy whatever he wanted even if it was in fortnite. My brother makes really good money and they're always eating out in expensive restaurants almost every weekend so there was really no need for them to use his money for that 😒