There are many options for useful gifts. Tell us more about your cousin and maybe we can advise you something. A good coffee maker is a great gift, but I know few people who don't have a coffee maker yet. In order for a gift to be truly useful, you need to know more about the person to whom you want to make a gift. For example, my parents tolerate heat very poorly, and this summer is very hot. I decided to give them a fan, as this will help them sleep better, because you need to turn on the air conditioner only 2-3 degrees lower. I decided to choose the best fan that would consume little electricity, but the air circulated well. I found this article
https://coolingfanreview.com/tower-fan-vs-stand-fan/ that really helped me find what I really need. My parents really loved this gift. For them, it's really useful.