What is the ruling if the man's Umm Walad nurses his father's wife with her milk?

Primary text

If the man's Umm Walad nurses his father's wife with her milk, she becomes prohibited to the man because she becomes his son's daughter (in effect, his granddaughter by adoption through fosterage). The father must seek recourse against his son for the lesser of either the financial obligation paid to his wife (dower) or her value, as this loss results from the action of the Umm Walad.