feel that you are a junior and the elders will not suggest any gift. I believe he will be satisfied with your intention. If you really want to show your appreciation, I suggest not to buy some messy things. You should give something with great practical value and generous and decent.
It is very good to give a fiery red tea set, because the tea ceremony has a high cultural heritage in China, which is both elegant and tasteful, and the fiery red appearance represents the prosperous life of the two people in the future. Of course, you can also give your uncle a pair of little dolls who will grow old together. There are many DIY dolls on the market now. You might as well try them. The price is reasonable and it means that the two will grow old together. It is the best of both worlds.