Took the kids to Disneyland in California

I reside in Japan, this was a family trip for my half-american kids

The boys were 2 and 4 when this happened, in a store at Disneyland California looking at some Donald Duck thing or other and chatting

Some random old American lady taps her fellow old American lady on the shoulder and points to my kids and says

"Oh how cute, they have their own language together!"

They were speaking Japanese to each other