My mixed-up files are less established than ol' Mrs. Frenkweiler's, but just as awesome.
For example, look at this new entry: young Mistah, and young Da Dowd, and young Mumsie, and young Bill Sr., and young Dr. and Mrs. Dowd, at UConn parents' weekend, 1982:
We're confident in our dating of this photo because of the notation on the back:
Mumsie makes a super-spectacular "T".
And in other mixed-up-files news?
But even better: