I have posted this on another FH web site, but some other eyes will be a bonus to see if there is anything to be found.

Though not strictly Buckinghamshire, it was where they were last seen, and the father was from Great Missenden, Bucks.
Henry Ives(1822.Gt.Miss) married in 1854 @ St Pancras, to Eleanor Sophia Reynolds, (1833. Strood, Kent).
Henry Ives died in 1870, Eleanor Sophia Ives remarried to a William Hallibone in 1873. Eleanor dies in 1875 in Lambeth.
Eleanor Ives and children last seen in the Eton Union Poorhouse in the 1871 census, @ Upton Cum Chalvey.
Children:
Henry George Ives, b1857. St Pancras. (Baptised @ St Pancras).
Thomas William Ives, b1860. St Pancras. (Baptised @ Camden).
William Peter Ives, b1862. Hatfield, Herts. (Baptised @ Addlestone, Surrey).
Eleanor Mary Ives, b1864. St Pancras. (Baptised @ Addlestone, Surrey).
Sarah Ives, b1869. Eton, Buckinghamshire. ((Baptized 21 Aug 1870,@ Upton Cum Chalvey) Mothers name only)).
Children seem to have been abducted by aliens, or adopted out.
This will be a bit of a treasure hunt, I feel.
Steve.
