In fact, for a younger sister, the blessing of her family is more valuable than any gift. You can choose some auspicious or commemorative gifts for her, so that she will remember the blessing of her family no matter where she is.
First, your younger sister is getting married, and she will leave this family to live her own life, but you will definitely miss each other, what should you do? It is better to customize a real clay doll with a family photo and give it to her, so that even if you can't be with her, she can still feel your love and support when she sees this doll.
Second, as a brother, you must hope that your younger sister is happy. You can customize a pair of engraved rings for your younger sister and brother-in-law, hoping that they can circle each other for a lifetime and have a sweet life.
Since you are all your own people, you might as well be more practical and choose something practical so that your younger sister doesn't have to buy it herself. Today's young people live a petty bourgeoisie life, so you can give your younger sister a fully automatic coffee machine, which is practical and high-end, adding points to their petty bourgeoisie life.