Ancestors are dead and gone, Parsley3. How can they provide DNA samples?
I have to correct MOnica, Victoria was born in 1819, she was 42 when Albert died. We have no idea when she went The putative date for this child is 1864/65 (according to the Daily Mail story) which would make her about 45 when it was conceived. We have no idea when she went through the menopause so 45 is a possibility. She was clearly very fertile, she had 9 children, the youngest being only 4 when Albert died. So. although fertility declines with age 45 isn't an impossible age for conception.
Personally I think it's a load of nonsense. She may have hidden herself away from the public during her extravagant mourning, but she would still have been surrounded with domestic staff, pages, household administrators, ladies in waiting and her still young family members. Not to mention contact with her government ministers. I think that had she been pregnant and given birth it would be impossible for it to stay secret for ever, something would have leaked out decades ago.
Maybe John Brown was her lover; she made no secret of her enjoyment of 'fun in bed', but a secret pregnancy? I don't think so.