Grandma had a full time job in a bank.
If Ann was sans baby Barry, one would think she would have taken a regular course-load in the Fall quarter 1961, instead of two night courses, which was the same courseload she took in the Winter quarter when we know she had baby Barry based on the baby-sitting recollections of her neighbor.
So the evidence points to Ann being with baby in Seattle in the Fall quarter.
Oh, OK, I stand corrected.