What is the ruling on acknowledging a child when neither mother slave has a husband, but the master acknowledges having intercourse with them?

Primary text

If neither slave has a husband, but the master acknowledges intercourse with both, they become *farash* (legitimate mothers via cohabitation), and their children are ascribed to him, provided that birth after his intercourse is possible. If intercourse is only possible with one, the acknowledgment applies only to her child, as that is the one whose paternity can be established by ruling.