Brad has added a room to his house in anticipation of his elderly parents moving in with him. as their oldest son, he feels obligated to provide care for them out of a sense of

Filial responsibility

Explanation: Filial responsibility is the responsibility or duty of the adult children towards their parents for taking care and supporting them. This responsibility is mostly done by children when their parents are in offspring stage. This act makes sure that the offspring parents don't have to feel helpless and homeless.

Brad is feeling bound to pursue his responsibility as an elder son , so he has added a room in his house for his parents.

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