D.M.
My daughter is 5 and my son is 3. She struggles a bit with "Rs" and he with "Ls". He calls her "YIDDY" (her name is Lily) and she sounds like she's from NY City! Anyway, one day she asked what letter I was working on and I explained grown ups have learned their letters by this time and we work on other things. That's when she told me "Mommy is working on patience!". Out of the mouths of babes...