in the novel JJBA Over Heaven, Dio writes about the women he chose to have children with. Dio writes, "Put more clearly, malevolent strength.— The more evil the woman, the more filled with wickedness she is, the better a mother she will become.
Cross, short tempered, and fertile. With no refinement, a foul mouth, and with no knowledge of manners. The more like that the woman is-- the better she is.
That is what I believed" Pg 49.
Perhaps that's why he chose the woman he did who would later give birth to Giorno.