Common Concerns and Troubles

DNA testing can be utilized when a partner refuses to recognize a child.

Also, regarding the 300-day post-divorce rule, if conducting a DNA test with the ex-husband is difficult due to DV or non-cooperation, a family court may allow a paternity mediation using DNA tests from the biological father to establish a family register.

If you have doubts about whether a child is yours, DNA testing can help resolve them.

If the mother is pregnant, prenatal DNA testing is available. If the child is already born, paternity testing is used.

To deny the presumption of paternity for a born child, husbands often file for a mediation of paternity denial in family court.

Many people use DNA testing to confirm parentage when they have doubts about whether a previously recognized child is biological.

DNA can be extracted from samples such as mouth swabs (rubbed inside the cheek 10 times vertically and horizontally) or toothbrushes to verify biological relation.

When filing a mediation in family court, the male side usually files for invalidity of recognition.

The 300-day post-divorce rule refers to the legal presumption where a child born within 300 days of divorce is automatically registered as the ex-husband's child.

Under Article 772 of the Civil Code, if a child is born within 300 days of divorce, it must be registered as the child of the ex-husband, making it impossible to register it as the child of the biological father even if they are remarried.

You may have seen this topic on news or dramas. seeDNA receives numerous consultations regarding DNA paternity testing related to this 300-day rule.

For details, please seeDNA Paternity Testing and the 300-Day Post-Divorce Rule.

If a birth registration is not submitted and no family register is obtained, disadvantages arise in attending school, voting rights, obtaining a driver's license, and marriage registration.

DNA testing is required when filing a petition in court to obtain a family register.

By performing a maternal DNA test between the biological mother and the unregistered child, the maternal relation can be established, raising the chance of registry acquisition.

If testing the alleged father is difficult (e.g., deceased), grandparentage testing can be performed using DNA samples from both biological parents of the father, alongside the child and mother.

If samples from both biological parents of the father are provided, the relation can be confirmed or denied with high accuracy.

DNA testing can be used to confirm whether siblings share a biological relation.

If a sibling's family register is found to be incorrect but the father is deceased, sibling DNA testing can determine the biological link. If they share the same mother, it is a full-sibling test.

On the other hand, if they have different mothers and want to verify if they share the same father, a half-sibling test is performed. If the mothers' samples are available, they should be provided.

If doubts arise regarding the heir during inheritance procedures after the deceased passes away, sibling or uncle/aunt DNA testing is widely used in court to resolve the issue.

Sibling DNA testing requires samples from at least the siblings being tested.

Uncle/Aunt DNA testing requires samples from the mother, child, and at least two biological siblings of the deceased father (a total of 4 participants).

DNA parentage testing to resolve child support issues differs depending on the perspective of the former husband or wife.

For former husbands, testing confirms if the child is biologically theirs before paying or continuing to pay child support.

For former wives, establishing the biological relation helps in claiming child support when the former husband refuses to pay.

Testing includes private and legal (court) options. Private testing is for mutual agreements, while legal testing is used for child support claims in family court.

DNA testing is utilized as scientific evidence for various applications when the child's father is a Japanese citizen or permanent resident, especially when the foreign mother's residence visa is expiring.

We often receive inquiries from parents who want scientific confirmation that the child conceived via IVF (in vitro fertilization) is biologically theirs, ensuring no embryo mix-up occurred.

In such cases, a double parentage test (maternity and paternity test sharing the same child) is typically conducted simultaneously.

As reported in the news, this is used for baby mix-ups due to hospital errors or verifying biological relations later in life. Typically, a mediation of non-existence of parent-child relationship is filed in court.

If you worry about infidelity, semen testing can help resolve it. In the past, proving infidelity was difficult and many suffered in silence. Today, advanced technology allows quick, affordable testing in as short as 1 day.

Detecting semen (sperm) is crucial for proving sexual assault. Once a stain is confirmed as human semen, personal identification can be determined via forensic testing (blood type and DNA profiling).

This proves whether a puppy is born to the parents registered on the pedigree certificate, verifying if they share the same bloodline.

Puppies inherit genes from both parent dogs. Matching inherited genes establishes paternity/maternity or proves non-existence.

According to the AKC, about 10% of pedigree records contain errors. Dog DNA testing can verify the true bloodline.

* The American Kennel Club (AKC), founded in the US in 1884, is a dog lovers' organization that manages registries for purebred dogs.