Is spending on a married female cousin (daughter of a maternal aunt) considered charity and upholding family ties, and is treating her well considered filial piety towards the mother and the aunt?

A husband's spending on his wife is of two types: obligatory and charitable/benevolent. The obligatory spending includes housing, food, and clothing. A man is rewarded for his spending on his wife and family if he intends it for the sake of Allah Almighty, and it is the best dinar a man can spend.