I have an uncle who gave me a good sum of money, just as a gift. He’s done well for himself and wanted to give me some just because. I’m very grateful

I’m about to go on a week family vacation and my Aunt (his wife) will be attending. (Unfortunately he won’t be attending due to work etc.) I’m not sure if she knows that he gave me some money? I’m not sure if I should mention it?— She’s a little unpredictable. Depending on her mood she’ll either be happy I got it and it helped, or she’ll be cold about it, even though she knows it’s not much to them and they don’t need it….I know I sure am grateful for it though. —Should I just not mention it? Or should I?