• Accuracy of 90+%
• To establish whether or not a brother and sister have the same father AND mother.
• 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 DNA samples from parents or other siblings. This allows us to pinpoint the exact origin of each sibling's DNA.
• If you wish to test 2 or more brothers, the Y chromosome may be a cheaper option. Click for brother to brother testing options.
• If you wish to test 2 or more sisters, please see our sister to sister page.

Summary of Sibling to Sibling Testing Costs: £299 (mother's DNA included for free)

• Accuracy of 99+%
• To establish whether or not a siblings have the same mother only.
• We sequence specific areas of DNA only inhertited from the mother (mitochondrial DNA).
• We use most respected and most widely used mitochondrial DNA analysis software in the world.
• All siblings to the same biological mother will have the exact same mitochondrial DNA sequences.
• If you wish to test 2 or more brothers, the Y chromosome may be a cheaper option. Click for brother to brother testing options.
• If you wish to test 2 or more sisters, please see our sister to sister page.

Summary of Mitochondrial DNA costs: £230 ( £99 for each extra person )