Every independent household has an obligation to offer a sacrificial animal

An elderly man has three married sons who live in one house that is divided into separate units, and each of these sons takes turns preparing the food, since each of them has an independent kitchen.And the question is: Is it recommended for them to offer multiple sacrificial animals or just one? And if it is one, do they share the cost of the sacrifice, or does it come from the money of one of them?
What I see is that each household must offer a sacrificial animal, because each household is independent.