When does the mother house finch stop feeding her babies I have not seen her around however the father is still tending the nest occasionally?

Mother house finches typically stop feeding their young around 2 to 3 weeks after they hatch, as the fledglings become more independent and start to leave the nest. After this time, the male may continue to care for the young, providing food and protection. If you haven't seen the mother around, it's possible she has already weaned the chicks and is focusing on other activities, such as nesting again or foraging. Keep an eye on the nest; the fledglings should be ready to leave it soon if they haven't already.