What is the best gift to give for my sister's wedding?

Today is my younger brother's birthday, what should I give to my wife as a gift... It's amazing that he's already 19 years old. I always feel like he's still the little kid who used to follow me around everywhere. What should I give him as a wedding gift when the time comes... Time flies and now both my sister and I have our own families. My younger brother is also striving for his future. Our parents have aged a lot. What is the best wedding gift for my sister... When I think back to what I was doing at 19... Haha, I was probably just daydreaming foolishly... And I used to overthink things, with extreme thoughts... I always felt like no one understood me, and that my parents didn't trust me... There were so many other things too... Anyway, I thought a lot... Maybe that's just how people are at 18 or 19, always thinking too much... Now when I look back, I realize how impulsive and extreme I was back then... But I've always felt that my younger brother is different. He has been more careful than my sister and I since he was little... He's more mature and considerate... He has his own opinions... No matter where he is or what he's doing, he always thinks about the family... My younger brother also has rebellious and capricious moments... But he's more mentally mature than us... Sometimes I even joke with him, calling him the older brother, and asking him what birthday gifts we should give to our elders... Whether in the past or now, he's always the first one to notice when I'm unhappy or troubled... My younger brother has always been like an adult... But now he bears more hopes and responsibilities... Younger Brother... Today is your birthday, and I want to tell you... No matter what, you are always the pride of your sister and our parents... Now that you're one year older, I hope you can handle everything more maturely and considerately... Because every step you take from now on will determine your future life... Sister hopes that you can be happy and successful every day...