"Wean" here is a polite way of saying the child was finished with breast feeding. AT: "Isaac grew, and when he no longer needed his mother's milk, Abraham had a large feast" (See: [[rc://en/ta/man/translate/figs-euphemism]])
The name of Hagar's son can be stated explicitly. AT: "Ishmael, the son of Hagar the Egyptian and Abraham" (See: [[rc://en/ta/man/translate/figs-explicit]])