Legal analysis: China law does not stipulate whether a daughter-in-law has the obligation to take care of her sick mother-in-law, so this is not a legal obligation, but from a moral point of view, a daughter-in-law should take care of her.

Legal basis: Law of the People's Republic of China on the Protection of the Rights and Interests of the Elderly

Thirteenth elderly care is based on home, and family members should respect, care and take care of the elderly.

Article 14 A supporter shall perform the obligations of economic support, life care and spiritual comfort for the elderly, and take care of their special needs. Supporters refer to the children of the elderly and other people who have the obligation to support according to law. The spouse of the supporter shall assist the supporter in fulfilling his maintenance obligations.

Fifteenth supporters should make the sick elderly get timely treatment and care; For the elderly with financial difficulties, medical expenses should be provided. For the elderly who can't take care of themselves, the supporter should bear the responsibility of care; If you can't take care of yourself, you can entrust others or pension institutions to take care of you according to the wishes of the elderly.