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Genetic testing is a useful tool for verifying a family relationship. Commonly tested relationships that utilize DNA testing include paternity, maternity, full-siblingship, or half-siblingship. More distant relationships cannot be proven reliably using DNA testing. DNA technology is the only non-documentary method accepted for proof of a biological relationship.
It is recommended to add the mother of the child to the testing scenario if at all possible when doing relationship tests. This is done to exclude her DNA. Keep in mind that the more individuals you add to the testing scenario, the better!

TYPES OF RELATIONSHIP TESTS

Maternity

Is most often performed when an adopted child believes they found their biological mother. Also used for immigration purposes.

Grandparentage

The grandparentage test is one of the better relationship tests to perform to determine paternity. It is generally done, by testing the child and the alleged father’s parents

Avuncular

Provides individuals with a statistical probability that a person is the biological aunt/uncle of an alleged niece/nephew.

Siblingship

Determines if individuals are full brother/sister, half brother/sister or unrelated.

Twin Zygosity

A twin zygosity test determines whether twins are fraternal or identical.

Y-STR

A Y-STR paternal lineage test determines whether two or more males are related through a paternal line.

Grandparentage

The grandparentage test is one of the better relationship tests to perform to determine paternity. It is generally done, by testing the child and the alleged father’s parents

mtDNA

A mitochondrial DNA maternal linage test determines whether two or more individuals are related through a maternal line.

 

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