He lied to his family that he found the twins outside of town

Since his father and the rest of his family does not contact them at the moment, he decided to raise his children along with his mother.

And everything was going smoothly with the claim that he found the twins on the street outside of the town on the road, which the townsfolks bought. And when his father and the rest of his family come to picked him and his mother up a year later, he lied to his father that he found them on the street and when Drew, who is still under Zak's control, confirmed this. He decided to let his son keep them, believing that his wife will never lie to him and also considered that it can be a good experience for Zak as a father as well before he and Wadi will get married.

Ever since then, William Saturdays and Elizabeth Saturdays become part of the family while growing up calling Zak and Wadi as their parents while calling Doc and Drew as their paternal grandparents. This is because Zak hid the fact hat he impregnated his own mother from everyone, including Wadi and his "adopted" children.