Where else could they be?

[Milliepede]

Yes I agree - here's another one to check

Arthur James Sep 1883 - Mar 1884 Huntingdon

[Milliepede]

You could be right with the sister in law

Charlotte Hardwick marriage to William Swales in St Neots 1 Jul 1861

father John Hardwick and one of the witnesses is Sophia Hardwick

Ann had a daughter Charlotte Sophia so she was probably another sister

[DonnaLou84]

Yes I agree - here's another one to check

Arthur James Sep 1883 - Mar 1884 Huntingdon

From what I see,Arthur doesn't appear to be theirs

[DonnaLou84]

You could be right with the sister in law

Charlotte Hardwick marriage to William Swales in St Neots 1 Jul 1861

father John Hardwick and one of the witnesses is Sophia Hardwick

Ann had a daughter Charlotte Sophia so she was probably another sister

Thank you, they do like to confuse us!haha..
But still no idea where James has vanished to....very strange

[Milliepede]

Ann had a few sisters who married but don't seem to be harbouring any of the Hills in 1891.

Have to leave it there for now but keep looking and something will turn up