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Jan begins to be allergic to something, and she thinks she is allergic to one of her new family members. After realizing it isn’t any her brothers, or Mike, she finds out that it’s the boy’s dog Tiger that she is allergic to. Jan apologizes to the boys, embarrassed.
When Tiger goes near Jan, she begins sneezing, and when he leaves she immediately stops. Real allergies aren't triggered right away, and take a while to go away. This was only done to create confusing to what Jan was allergic to, and was only done to make the plot work. In reality, it wouldn't happen.