It is a sign of a special bond, the family's own vocabulary. Many many moons ago when my 2 sprouts were very young, the developed a secret language. I was privy to a few words here and there. And I am risking life and limb by sharing this because I do recall an oath against my death if I ever did share such secrets. Let's just say it is not uncommon for a few of those secret words to enter a convo between the 3 of us today LOL! Good times indeed!