Is the wife of the maternal uncle considered his foster sister, given that she was nursed by his mother, and he was not nursed by her mother?

If a woman nurses from the man's mother five known breastfeedings during the nursing period (two years), then she becomes his sister, and the marriage between them must be annulled. However, if the nursing is less than five breastfeedings, it is recommended for him to leave her as a precautionary measure, out of consideration for the scholarly difference of opinion on this matter. In the event of the annulment of the marriage, the children are attributed to them because the marriage was contracted under the presumption of permissibility.