I think the Harris home was pretty standard for the area. His dad probably had money from the military and more than likely made a good living.
Sue talks about the house and their financial situation in her book. The area they lived in is now filled with million-dollar homes and according to her book they had a LOT of work to do on the house, so it was not necessarily as nice as the others in the area. They were probably considered middle class/upper middle class.
They had more money than me growing up that's for sure.
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"And you know, you know, you know, this can be beautiful, you say you're numb inside, but I can't agree. So the world's unfair, keep it locked out there. In here it's beautiful."