Is it permissible for my son to marry his maternal uncle's daughter, who was nursed twice with his younger sister by my wife?

The girl who breastfeeds from your wife a nursing that is legally recognized becomes your daughter and your wife's daughter through suckling, and a sister to your children through suckling. It is forbidden for your son to marry her, due to the saying of the Prophet, peace and blessings be upon him: "What is prohibited by lineage is prohibited by suckling." The suckling that prohibits marriage consists of five recognized sucklings within the first two years of life. A suckling is recognized by custom when the child takes the breast, sucks from it, then leaves it, turning away. The suckling that prohibits marriage is completed with five such instances.