Is learning how to manipulate grandparents against parents by 19 months impressive or just scary?

My Mom is visiting this week to watch the monkey for us while my mother in law is on vacation (she usually watches her one, or possibly three(! depending on my husband's schedule) days a week).

Yesterday I came home and my Mom told me how good she'd been. No crying and hardly any whining all day. Happy and helpful and listened - all those things.

Within a few minutes of me arriving home - whining and crying had started. My Mom looked at her and said - what is this? I just finished saying how good you were!

The monkey has learned the importance of grandparents and begun to master toddler-dom. Ah, I am so "proud," young grasshopper. (But still tired, so could you PLEASE quit whining?!)

Well, truthfully, she hasn't totally mastered manipulation. I mean she TOTALLY showed her hand in front of Grandma at the end there. (Whatever. Maybe she also realizes she's an only grandchild and is going to be completely spoiled regardless.)