According to Feng Shui theory, the orientation of a house can represent children, right?

That's right. The northwest of the house (dry palace) represents the father southwest (Gong Kun) represents the mother east (Gong Zhen) represents the long male north (dry palace) represents the middle male northeast (dry palace) represents the young male southwest (Gong Xun) represents the eldest daughter (eldest daughter-in-law), the south (divorced palace) represents the middle female (second child or middle female), and the west (anti-palace) represents less (smallest).