It is inevitable that sisters have deep affection, but when a girl grows up, she should get married. Shouldn't your elder sister be happy for having a good husband to take care of her? But it is normal to be reluctant to part with your elder sister, after all, she has been taken care of by her for so long.
You need to give a gift to your elder sister's wedding. The most suitable wedding gift for your elder sister is that you should make a gift for your elder sister by yourself. She will definitely treasure it well. You can make a cross-stitch for her by yourself, embroider a suitable and beautiful pattern, embroider your own blessings, and hang it at home, which is very warm.
You can customize a pair of creative couple cups for your elder sister and brother-in-law, put their photos and videos on the cups, and pour hot water into them to show them. Such a good sister-in-law, your brother-in-law will definitely welcome you to visit his house often, hehe.
Other gifts suitable for your elder sister are recommended: real-life wedding dolls, a pair of teddy bears, crystal ornaments, etc.