Is it permissible to marry the daughter of a son whom the stepmother breastfed with one satisfying suckle?

If the suckling means a single latching onto the breast, then it does not prohibit marriage, and it is permissible to marry the daughter of the wet nurse. However, if it means a single session, then consider: if the child suckled five satisfying sucklings in that session, he becomes your foster brother, and thus it is not permissible for you to marry her daughter. But if he suckled less than five sucklings in that session, then no prohibition occurs.