Our range of various relationship tests helps to establish family connections
DNA testing can not only tell you who you father or mother is but also who may belong to your extended family.
Besides, twins can be found out to be fraternal or identical twins with a zygosity DNA test. And only us at Eurofins can show the paternity if identical twins both may be the father of a child.
Whatever your question may be, we aim to help you finding the answer. Please call beforehand to discuss your case.
DNA tests may show a shared common ancestor for people with the same surnames
DNA creates an undisputable link between generations. It can help to reconstruct family trees petween individuals who share the same name.
Therefore, Y-DNA tests are performed to establish a relationship between male participants. Since the Y chromosome is only passed down the mal line from father to son it clearly shows relationshsips between men and can hint to a former shared common ancestor.
A female line can be proven by testing the mtDNA (mitochondrial DNA) which is passed down only from the mother to both, sons and daughters. Therefore, if we find a match in the mtDNA of two individuals then it is very likely that those two share a common maternal ancestor.
Siblings may share one or both parents
A DNA test can be conducted to determine if persons share the same biological mother and father. A full siblingship exists between persons who share the same biological mother and father. If they only share their mother or father they are considered as half siblings.
A DNA sibling test can also be an indirect way to establish family relations when the putative father is not available for testing.
Of course, also a joint biological mother can be determined between the participants. Please keep in mind that if the putative mother is willing to participate in the test a maternity test will be easier and cheaper to establish a biological mother.
A sister test may find your biological sister even without participation of parents
If sisters share the same biological a full siblingship can be tested with the determination of a biological father.
While women possess two X chromosomes (XX), men have one of each, one X and one Y chromosome (XY).
So men will always inherit their father's one X chromosome while the mother will pass on one of her 2 X-Chromosomes. Accordingly, in a sister full-sibling test you can determine a shared biological father by analyzing the X-chromosomes the sisters inherited.
This test can be more conclusive if the mother participates.
If the question is whether the sisters share the same mother we can conduct a classical maternity test including the mother's samples. If the putative mother is not available for testing we can perform a sibling test using the mitochondrial DNA
A brother test shows the paternal line and determines if the male participants share the same biological father
A Y chromosome test is used to examine if 2 or more male persons belong to the same paternal line. Men possess one X and one Y chromosome. Their sons will always receive the Y chromosome from their biological fathers. Accordingly, a Y chromosome DNA test establishes a biological relationship between men. Still, this relationship could also mean they are cousins or nephew and uncle, it does not conclusively show they are brothers.
While a Y chromosome test will establish a relationship through the paternal line this extensive DNA test will provide a likelihood for full, half or no siblingship between males. Such a DNA test is recommendable if there is a risk that 2 male relations may be the biological father.
With a DNA test we can also determine if two males share the same biological mother. The mother's samples are not mandatory for this analysis.
A sibling test determines the statistical probability that two individuals are full or half brothers or sisters
Full siblings are individuals who have the same biological mother and the same biological father while half siblings share only one parent.
With this DNA analysis male and female participants are tested to determine whether they share the same biological parent(s) and are therefore full siblings.
When genetic matches between the participants can be found we will calculate the statistical probability of relationship. With the samples of the putative father the DNA test results will show a probability of 99% and more.
Please contact our dedicated support team for a case specific consultation.