If your family member prefers warm food, you may gently warm but not cook the food in the microwave or with hot water being careful not to cook the food.
Heat the food in the microwave in 10 seconds intervals until it is no hotter than "warm mouse body" temperature.
Hot water instructions:
Place the food in a waterproof container, and place the container into a larger container filled with hot water, similar to the idea of a double boiler. Do not heat past the aforementioned "warm mouse body" temperature.