Legal analysis: Children whose biological fathers fail to fulfill their maintenance obligations should do so. Because maintenance obligation and maintenance obligation are two independent obligations, maintenance obligation is not based on maintenance obligation. That is, whether parents fulfill their maintenance obligations does not affect their children's maintenance obligations to their parents.

Legal basis: Civil Code of People's Republic of China (PRC).

Article 26 Parents have the obligation to support, educate and protect their minor children. Adult children have the obligation to support, help and protect their parents.

Article 1067 If parents fail to perform their maintenance obligations, minor children or adult children who cannot live independently shall have the right to ask their parents to pay alimony. Parents who fail to perform their maintenance obligations, lack the ability to work or have difficulties in living have the right to claim alimony from their adult children.

Article 130 The share of inheritance of heirs in the same order shall generally be equal. Heirs who have special difficulties in life and lack the ability to work should be taken care of when distributing their inheritance. Heirs who have made major support obligations to the decedent or lived together with the decedent can get more points in the distribution of the estate. If an heir who has the ability and conditions to support fails to perform the obligation of support, he shall not divide or divide the estate. If the heirs agree through consultation, they may also be unequal.