"....until 1966 would make a middle class American family jealous",
应该是
“....until 1966 would make ANY middle class American family jealous",
(a family 只是泛指某一家). 或可写成
"any upper-middle class American family"

最后一段
" if you don't have any questions about this memoir………”

既然是调侃, 不妨再加点噱头
“If you have absolutely no personal stake in defending her and still choose to believe her story, then
CONGRATULATIONS! You have a brain that can be 3D-printed, rather easily, by her company’s technology."