Send a red envelope to wish my nephew a happy birthday. My sister confiscated it. How should I reply?

Thank you for your concern. A red envelope is just a gift. I hope my nephew likes it and is happy. I also wish you and your family health and happiness. This can not only express gratitude, but also show your sincerity and goodwill. At the same time, you can confirm to your sister again whether you need your help and support, so as to provide corresponding help when necessary.