Fostering a mother cat and her kittens requires providing a safe and comfortable environment, proper nutrition, and veterinary care. Socialize the kittens by handling them regularly and encourage their play. Allow the mother cat to nurse her babies freely and provide her with a secluded spot. Gradually introduce solid food to the kittens and litter train them. Monitor their health, ensure vaccinations, and seek professional advice if necessary. Show love, patience, and care to help these adorable feline family members flourish.