This will be very short.
My family were largely working class.
I have several cousins that I know who have their degrees maybe in the 80s and there may be some who I may not know who have gotten degrees in the 80s or earlier.
My Dad attended Brown on scholarship but then life happened he didn’t finish.
So, I guess my cousins, my mother, an uncle could be counted as first known, for me. Family chime in if you know of any before the 80s.