I don’t know if this is above average, normal, or below average for a 2.5 year old, but the following exchange left me impressed yesterday:
Me: I am married to your mom. So, your maternal grandmother is my mother-in-law. Who is my father-in-law?
Scarlett: Maternal grandfather!
I also heard that while she was in NYC she correctly surmised that my wife’s grandfather was my mother-in-law’s father.