Every kid should have an older brother he can look up to. I feel sorry for those kids who don't care for their older brothers as I do mine. A boy requires understanding, protection, and a strong sense of belonging and identity. I guess Kevin was my security blanket. It wasn't that he allowed me to follow him around puppy-style. I can't explain it; he was just there—like the Rock of Gibraltar.

Q. Underline the sentence which further explains the statement expressed in the first sentence.