^^^ I didn’t have an older sibling, but I’ve been one. My brother and only sibling is 8 years younger than I am. I never lectured him or gave him “a good talking to.” But, I was always there for him, and he knew how much I cared.
When my brother was a teenager, he briefly fell in with a group of bad kids. He ended up getting arrested. I made the 8-hour drive home, and all I said was, “I think we need to talk.” We spent about 4 hours together, mostly with him speaking and me listening. That was the first and last time my brother got into serious trouble.
Flash forward 35 years, and we’re still the same way with each other. Once, I knew that I’d become too dependent on alcohol, so I reached out to my brother for help. He didn’t give me advice or tell me what to do; he just listened, said a few reassuring things, and helped me understand that I had the power to fix my problem. He was right.