What is prescribed is for each household to offer its own sacrifice.
Shaykh Ibn Baaz (may Allaah have mercy on him) was asked about a married man who lived in a different city than his father – would his father’s sacrifice count on behalf of him and his children?
If you live in a separate house, then it is prescribed for you to offer a sacrifice on behalf of yourself and the members of your household, and your father’s sacrifice does not count for you, which is on behalf of him and the members of his household, because you do not live in the same house with them, rather you live in a separate house. End quote.
The Standing Committee was asked:
I have two families, each living in a separate house, and the houses are 200m apart. They are my family and my father’s family, and my father is still alive. My question is: is it permissible for my father and me to offer one goat as a sacrifice on behalf of the two households, or not?
What is prescribed is for each household to offer its own sacrifice. End quote.
Fataawa al-Lajnah al-Daa’imah, 11/406.