In this task, you will use your knowledge about language (and common sense) to determine what element the marked number refers to. The numbers are marked with two underlines around them, like: _ number _. Your answer should be chosen from the given text, and should not contain other words.
Q: Dr. Spencer Reid: If someone 's carrying on in Catherine 's mission , then it 's quite possible they both suffered from * folie a deux * , a shared psychotic disorder between two people who are extremely close , and that would mean it 's most likely a family member .
David Rossi: Maybe _ one _ or both of her kids .
A:
kids