What gift should my girlfriend's sister's son give for the full moon?

Put yourself in others' shoes. Just your girlfriend's sister, not your sister, nor your daughter-in-law's sister. Although I can't say that I pay attention to returns, what should I do if I break up with my girlfriend? I don't think it should be too expensive, so I don't need gold ornaments. Buying a gold lock is generally more than 800 yuan, and children can't wear it. My son's is still throwing Forget the silver ornaments, it's a bit shabby; I think according to the oldest concept of China people, just give cash.100,200 or even1000,2000 depends on your financial strength. In fact, I had this mentality when I was cooking full moon wine for my son, and the conditions at home were not so superior. It better be affordable. I think I will get it!