It's probably a well known fact that younger kids tend to ape their older siblings. Generally it's possible to handle in variety of ways and isn't that big of a deal.
One way where I'd like some input is the following situation:
Older sibling say something hurts or has some illness symptoms (e.g. say his throat hurts, etc...). It's a legitimate complaint.
Younger one immediately apes this by saying her throat hurts as well.
This is a problem, because:
Being a sore throat, it is kind of difficult to verify.
Being a pair of kids in preschool, we can't simply ignore her complaint since they DO quite frequently catch assorted illnesses simultaneously.
She is one of those kids who LIKES "while sick" treatment in general - our "cold/flu" diet is something she likes, she WANTS to be given medicine (don't ask), she LOVES going to our pediatrician. So the usual approach (recently discussed in a separate question about faked illnesses by schoolchild) don't seem to work at all.
While she can generally be reasoned with, this situation is something she listens to our explanations and proceeds to behave as usual, no matter what the reasons, punishment, etc...