« Reply #8 on: Sunday 21 April 13 03:04 BST (UK) »
Sometimes I have seen the head of household not being the oldest family member, so maybe there is a father or mother of Ann, and James, assuming that he is her brother. This may not be the case and with other theory,s the only way to tell is to check the household and family.
If it turns out that the age is correct, it might pay to check next door. The father could be there.
Mind you, it's not as if it's the first transcription error from ancestry.

I am Australian, from all the lands I come (my ancestors, at least!)
Pine/Pyne, Dowdeswell, Kempster, Sando/Sandoe/Sandow, Nancarrow, Hounslow, Youatt, Richardson, Jarmyn, Oxlade, Coad, Kelsey, Crampton, Lindner, Pittaway, and too many others to name.
Devon, Dorset, Gloucs, Cornwall, Warwickshire, Bucks, Oxfordshire, Wilts, Germany, Sweden, and of course London, to name a few.