Is the sister of the suckling brother considered my sister through suckling, bearing in mind that I have not determined the number of satiating sucklings I received from his mother?

If a woman breastfeeds a child under two years of age five separate times, he becomes her son, and all those who are forbidden to her blood-line son become forbidden to him. The reference for defining a suckling is custom. A suckling is when the child grasps the breast and sucks milk; if he lets go and returns, it counts as another suckling. If there is doubt about the number of forbidden sucklings, the prohibition is not established. However, it is more cautious to refrain from marrying the daughters of the wet nurse, out of consideration for differing opinions.