http://digbig.com/4mabc
"DNA testing is routinely used in immigration cases to prove whether a child under 18 is a biological child of or, in some cases, is related to an individual with a leave to remain in the UK. If DNA testing results indicate that the child is unrelated to the claimant, there may still be grounds for the Home Office to concede the application. If there is evidence that the child has been brought up as a member of the family he or she may be qualified for admission as de facto adopted child. In cases where the child is not a biological child of the parents but is related to them, the child may qualify as a dependant of a relative other than a parent."
