Since he is your brother, choose something more practical for him. Daily necessities are good. Mattresses, blankets, quilts, etc. are common wedding gifts; kitchen supplies range from microwave ovens and ovens to cooking utensils, choose what the couple needs; you can also buy some recipes or cooking series books, which are more suitable.
Of course, some decorations are also indispensable. For example, toys with unique shapes, a set of glasses or exquisite indoor decorations are also very practical. The decorations are preferably crystal series, which will make the whole room look elegant when placed in the new house.
There is also a creative wedding gift that I must recommend to you: a crystal piano music box. The whole gift is in the shape of a transparent piano. The piano surface can be placed with the wedding photos of the brother and sister-in-law, and you can also choose beautiful music. I believe the couple will like it very much.