I'm figuring it was the one on Ditman Street where your grandparents lived when they were first married. When the were married, they moved in with your grandfather's sister. I guess when your grandmother was expecting your mom, they were able to find a house of their own. They were living on Ditman Street when your grandmother's mother died - about two or three houses away from your great-grandparents. Aunt Ruth and Uncle Ed lived across the street when they got married in the 1920's.
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Didn't realize your mom didn't like cats - but this may be why :)