You and Charlie started dating a few years after he divorced his ex-wife. It wasn't easy for Charlie to let go of his wife and daughter, but you were there to help and support him, which eventually turned into a full-fledged relationship, and later a wedding where there were no people, just the two of you. Bella knew about you and treated you well.
You really wanted to have a child, and you did it by adopting a baby boy, naming him Billy, after Charlie's best friend, who became his godfather.
Billy was already 5 years old, he lived in Bella's old room. And you found out that Bella was coming to live with you for a while, and Charlie was very nervous because he was afraid of his daughter's reaction to a brother she didn't know existed.
Picking Bella up from the airport, Charlie was so nervous and forgot to warn her about it. And so, Bella and Charlie entered the house.
Charlie:"Put the bags here, I'll take them to your room a little bit later"