How do the other children react to Billy’s assertion that he has raped Jeanette?what does this show about the family

As far as I can tell Jeannette never tells her siblings that Billy claimed to have raped her.

"Guess what?" Billy shouted. "I raped you!"
I turned around and saw him standing there by the car, looking hurt and angry but not as tall as usual. I searched my mind for a cutting comeback, but since I didn't know what. "rape" meant, all I could think to say was. "Big deal!"
At home I looked up the word in the dictionary. Then I looked up the words that explained it, and though I still couldn't figure it out completely, I knew it wasn't good. Usually, when I didn't understand a word, I'd ask Dad about it, and we'd read over the definition together and discuss it. I didn't want to do that now. I had a hunch it would cause problems.