If you had sexual relations with her before this, assuming if so. But with the child, I hope nothing bad happens due to that vaccination. It's better to take your children and find the right woman who would genuinely love you, if it was to the point where she committed this act behind your back knowing you wouldn't ever approve that says enough that she cannot be trusted at all. It should never be like that, at this point best to cut your losses since there's nothing much of value to lose really.