Our expert says:
Sometimes a teenager can be so immature in their actions. But this sort of sibling rivalry and mutual unpleasantness isn't at all uncommon (see what our regular readers have to add on this !)
<br/>Have a calm chat with the older one, reminding her that she is becoming an adult, and one doesn't always have to accept the younger one's invitation to be irritated.
<br/>Its not about the age gap as such, and will end. When they're 85 and 77, they might even be pals !
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