Since u can't take yr money w u after u die, spend wisely in major festivals.
This is for children extra pocket money to buy festive food and products to make them enjoy the festival.
Likewise, pass on this angpow giving to the next generation where u were a childhood before.
Once a year of giving festival angpows to yr siblings children enrich their festival experiences of their childhood days of getting angpows from uncle and auntie like you.
Just don't put too much money in it which may cause misunderstanding among siblings which create animosity with yr siblings and parents.
Be humble.