Imagine having a person in your family who is very close to you, like a best friend who you can always play with and share your toys with. This person is your brother.
Brothers share a special bond because they come from the same parents and grow up together. They often do things together like playing games, watching movies, and going on adventures.
Your brother is someone you can trust and talk to about anything. He can help you when you need it, and you can help him too.
When someone says "he was my brother," it means that this person had a special relationship with a sibling who has passed away. Even though the brother is gone, the love and memories they shared will always be remembered.