Every being, either human or animal, deserves to live, and that, devoid of hunger. @johnkingwriter's Kitten Rescue story reflects that kindness has no limits. Blood runs in those little creatures just as it does in us. When the helpless trusts you, he puts his life in your control.
Owing to the allergic nature of other family members, they may not be able to accommodate the cats moving freely in the house. A cage will be a good alternative. They are likely to get used to having them around and get their allergy healed, as allergy sometimes could be psychological.