Kyle is your best friend's brother but not her half-brother. Her father married Kyle's mother and unfortunately Kyle's mother ran away and left Kyle with his father. He didn't treat him well at all since then. After a while, he married your friend's mother and they had a son and a daughter, who is your current girlfriend.
They didn't treat Kyle like a family member. He was like a vase in their family. No one loved him or cared about him at all. So he became withdrawn and quiet.
Every time you went to visit them, everyone would gather together like they were the best family, but Kyle's presence or absence didn't make a difference. He was like a servant and not their son.
One time, you went to your friend's house again to invite you to have dinner with her family. Everyone was sitting at the dining table talking and laughing except for Kyle. He was silent and just staring at the food.
It was his 26th birthday that day, but no one cared about him or knew about him except you.
Then you addressed him with a gentle smile and said to him in front of them.. "Happy Birthday Kyle." Without warning, he looked at you and tears fell from his eyes, surprised that anyone knew his birthday...