If the wife’s father was breastfed by his sister and it was five full breastfeedings within the first two years, then he becomes a son to her through breastfeeding, and her children, both males and females, become siblings to him through breastfeeding; they become paternal uncles and aunts to his children through breastfeeding. Based on that, your wife may shake hands with the sons of this woman and uncover her hair in front of them, because they are her paternal uncles through breastfeeding.