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When the father has passed away, the existence of the parent-child relationship can be proven through paternity testing, household registration files, birth medical certificates, relatives' testimonies, and court proceedings.

1. Paternity test

The genetic relationship is determined by comparing the DNA samples of the children and their father's direct relatives, such as grandparents, brothers and sisters. It is necessary to choose an institution with judicial qualifications, and the appraisal report will have legal effect. If the father retained biological samples such as hair and blood stains during his lifetime, direct comparison can also be made.

2. Household registration files

Query the children's information registered in the father's household registration file, or retrieve the birth declaration record. The kinship certificate issued by the public security organ can be directly used as evidence. You need to bring your ID card, father's death certificate and other materials for processing.

3. Birth medical certificate

The original birth certificate can be used directly if the father's information is registered. If it is lost, you can apply for a replacement from the original issuing agency, and you need to provide your parents' marriage certificate, father's death certificate and other materials. Some hospitals keep delivery record files, which can assist in proving the birth.

4. Testimony of relatives

Collect written testimonies from relatives who live together, such as mothers and uncles, detailing the facts of the parent-child relationship. Witnesses need to cooperate with the notary office to notarize or appear in court to testify. The testimony of multiple people can strengthen the proof by corroborating each other.

5. Court proceedings

To file a lawsuit to confirm the parent-child relationship with the court, the judge will make a comprehensive decision based on a combination of the above materials. During the lawsuit, you can apply to obtain third-party evidence such as the father’s workplace personnel files, social security records, etc., and the judgment has mandatory effect.

It is recommended to give priority to obtaining written certificates from the household registration department or medical institutions. If the materials are insufficient, multiple pieces of evidence can be prepared simultaneously. When it comes to legal matters such as inheritance, consult a professional lawyer as early as possible to develop an evidence plan. Pay attention to retaining traces of his father's life such as photos and letters during his lifetime as evidence, and avoid damaging the integrity of biological samples during processing.