Answer:
Their ancestors
Explanation:
An indirect object is the part of the sentence that answers the question "to whom?" or "for whom?" This happens when a sentence has a direct object as well. The direct object answers the question "what?" In this case, we would ask "what do some families cook?" The answer would be the direct object (ceremonial food). The indirect object is found by asking "to whom?" or "for whom?" Since the ancestors are the recipients of the food, this is the indirect object.
