The questioner’s nephew, who the questioner wants to adopt, will be marriageable to the questioner’s wife and daughters when he reaches the age of puberty. However, if the questioner’s wife breastfeeds him during the breastfeeding period (i.e. during the first two years of his life), then he will be the foster son of the questioner and his wife and the foster brother of the questioner’s daughters, and after the age of purity, he will not be marriageable to the questioner’s wife and daughters.
