Forget Me Not Post #4- Prediction

At the end of Forget Me Not Willa is on the beach by herself. She is sad because JFK has left her for the month to go to baseball camp in Florida. Salty's owner has claimed him from the pound. As she is walking down the Spit she sees a boy that looks a little older than her. He starts talking to Willa about books, she says he looks familiar to her but she doesnt know where she has seen him. Then she remembered he was the guy spying on her in the window He said he has been watching her for the past week. When they are talking Willa heard a dog barking, it was Salty. Then they keep talking and the guy says something to Willa using her name. She asked how he new her name but didnt get to finish because all of a sudden JFK comes running to Willa, she thought he had left to go to Florida already, but his plane got overbooked. The JFK turned to the guy asking him who he was. The guy says dont worry, I'm not her boyfriend, I'm her brother. The it says TO BE CONTINUED.
So now I am going to make a prediction about the next book to come. I think since Willa thought she was an only child she will be so shocked. Her mother has never mentioned her brother. Neither has her dad since he was dead from a jelly fish stinger. I think will find out her dad was never really dead, then he left her and her mom. Then her dad went to go get remarried and had another child with someone else.