(Click Here to Order a Free Collection and Information Kit for Sister to Sister testing)

There are two major testing options for sister to sister tests.

1. X-chromome testing. £329 for 2 persons (£99 for each extra person)

X chromsome testing is used to see if two or more female persons with different mothers have the same biological father. If you wish to know if they also have the same Mother, or you are not sure if they have different mothers then you will require a Full Sibling to Sibling Test.

X-chromosome testing is your least expensive option while obtaining very high accuracy (99.9%+). Think about the two female persons you want to test. If it turns out that they do NOT have the same biological father, then can you rule out the possibility that each of their real biological fathers were closely related? (ie, could each of the 2 sister's father's be brothers?, or cousins?)

If the answer is no, then a X-chromosome test is a great option. All men have one X chromosome, it is passed down from Father to Daughter, woman have two X-chromosomes. Therefore a Father and his 3 Daughters will all have at least one of their X-chromosomes exactly the same (the X from their father).

2. Full Sibling to Sibling testing. £429 for 2 persons (£99 for each extra person)

If perhaps the 2 or more sisters that you want tested have different fathers that could be related, or if you want to know if the persons being tested have the same Mother, then you require a Full Sibling to Sibling Test.

This test investigates a high number of DNA regions. Full or half siblings will differ in the amount of DNA that they share. A Full Sibling to Sibling test looks at so many pieces of your DNA that we can make an assesment of your relationship.

To have the Mother's DNA sample (from both or either sisters) reduces the test cost because the Mother's DNA helps us to analyise the relationship between the 2 sisters faster.

Summary of Sibling to Sibling Testing Costs: