I also read someplace that Franky was home educated by tutor for a time. His mother’s and sister’s books are quite popular among homeschoolers today.
I am wondering about the religious affiliation ofg his sisters. IIRC one of them became Anglican and Franky is Orthodox, wonder what the other 2 are?
I would assume they would be (or were, anyway) PCA. Francis and Edith were associated with the (then) Reformed Presbyterian Church denomination prior to their births. That denomination eventually merged with the Presbyterian Church in America (PCA, not the PCUSA). From what I've read, Francis and Edith were still members of the PCA as of his death in 1984.
One of the telltale signs that Frank(y)'s engaged in half-truths about his parents, is the constant references to them as being evangelicals and fundamentalists. Franky knows better than to use those terms in reference to the PCA. He's just playing to his liberal/Democrat audience.