You caught your child sneaking some cake from the fridge.
I asked some native speakers if "I will report you to your mom" is natural, but they told me they ofte say "I am telling on you" instead.
But that sentence is not completed because it needs a addressee like "to your mom" or "to your teacher".
I am not sure if "I am telling on you to your mom" is idiomatic but according to my research, it seems that people will say "I am telling your mom" instead.
Is "I am telling on you to your mom" idiomatic?