Giving a wedding gift like Bitcoin is very rare in my country, of course it is something special for your sister and teach your sister how to use a secure bitcoin wallet and be careful of phishing and scammers, by giving a bitcoin gift to your sister, hopefully also your sister can continue the accumulation to later be given to her grandchildren.
Really i can see how time is changing. Previously during marriages, the inherited gold was transferred to the children from parents and grand parents and so on. Sooner or later this physical gold will be replaced by digital gold (bitcoin
BTC) and parents will transfer bitcoins on marriages. This is what we call digital transformation.