http://www.ukvisas.gov.uk/en/ecg/set...ldren#18165823
if he thinks he's the father and then the DNA test shows he's not..
Child not related to claimed father
The ECO must handle such cases with sensitivity as it may not be obvious whether the husband or other family members know of the true relationship and there may be serious repercussions for the wife and child if the information is disclosed (see illegitimacy below).
There may be any number of reasons why a claimed father may not be a child's natural father including the death of the first husband, rape or adultery.
Illegitimacy
Where DNA evidence indicates that a child may be illegitimate, the ECO should:
* try to establish the truth of the family circumstances by interviewing the child's mother as discreetly and sensitively as possible. Referring the case to the UK Border Agency to interview the sponsor should be avoided.
If no information can be elicited from the mother, the best way forward may be to seek information from the sponsor's representatives (depending on whether they are known to the ECO to be willing to respect the confidence of all parties).
If it appears that an illegitimate child has been brought up as a child of the family, it will normally be appropriate to admit the child under paragraph 297(i)(f). The fact that the sponsor may not be aware that the child is not his natural child should not preclude entry clearance.
The ECO should not routinely disclose information about the DNA report to the sponsor or other family members in cases involving the illegitimate children. However, under the Data Protection Act applicants and sponsors have a right to see personal information about themselves, which we may hold.
