1 .2. Daughter-in-law's filial piety to in-laws is not a legal obligation, but a manifestation of traditional virtues and social public order and good customs. The kinship between daughter-in-law and in-laws is based on marriage. Without marriage, there is no kinship, so there is no legal obligation in this relationship.
Legal objectivity:
People's Republic of China (PRC) Civil Code
Article 13 1
Appropriate inheritance can be given to those who rely on the support of the decedent other than the heir, or those who support the decedent more than the heir.
People's Republic of China (PRC) Civil Code
Article 129
Widowed daughter-in-law has done her main duty to support her in-laws, and widowed son-in-law has done her main duty to support her in-laws, so she is the first heir.
People's Republic of China (PRC) Civil Code
Article 123
After the beginning of inheritance, it shall be handled in accordance with legal inheritance;
If there is a will, it shall be inherited or bequeathed according to the will;
If there is a legacy support agreement, it shall be handled in accordance with the agreement.