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Home » Relationship Tests » Brother to Brother DNA testing

SIBLING DNA TESTING - Brother to Brother DNA Test

There are two major testing options for brother to brother DNA tests:

Are you testing to see if you have the same father or the same mother (or both)?

1. Y chromosome DNA testing - Brothers testing for the same father

  

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  • Accuracy of 99.9+%
  • To see if two or more male persons have the same biological father. (If you wish to know if they have the same mother, you will require a Full Sibling to Sibling DNA Test)
  • Only men have a Y chromosome, and a father will pass exactly the same Y chromosomal DNA to all his sons. Therefore, 2 brothers with the same biological father will always have exactly the same Y DNA patterns.


    • Note: If 2 men share the same Y chromosome, this shows that they share the same paternal line - so they could be father-son, uncle-nephew, cousins, etc.
 

Summary of Y Chromosome DNA Testing Costs:

DNA Test
Accuracy
Cost
Order

Brother to Brother
(2 persons)

99.9%

£199
or

Brother to Brother
(3 persons in total)

99.9%

£199
or

Brother to Brother
(4 persons in total)

99.9%

£274
or

Allows you to purchase the DNA test immediately.
We will post you a free kit with forms and information. You can decide to purchase a test at any time.

 

2. Full sibling to sibling DNA testing. Brothers testing for the same mother and father

  

 
  • Accuracy of 90+%
  • To establish whether or not two brothers have the same mother (and father)
  • High number of DNA regions analysed.
  • Uses DNA statistics to evaluate the amount of DNA sharing and to deduce a biological relationship. Full siblings have a lot more DNA in common than half siblings. Half siblings share more DNA than unrelated persons.
  • For a higher accuracy, include the mother's DNA sample (from both or either brother).
 
Summary of Sibling to Sibling Testing Costs:
DNA Test
With Mother's DNA
Accuracy
Cost
Order

Brother to Brother
(2 persons)

with no Mother's sample

90%

£379
or

Brother to Brother
(3 persons in total)

with 1 Mother's sample

95%

£379
or

Brother to Brother
(4 persons in total)

with 2 Mother's sample

99%

£379
or

Allows you to purchase the DNA test immediately.
We will post you a free kit with forms and information. You can decide to purchase a test at any time.
dna testing brothers

Click to order FREE Sibling to Sibling or Y chromsome information and collection KIT