Can anyone trace these people?

[Nell]

Ancestry has this baptism:

London, England, Church of England Births and Baptisms, 1813-1917

Name: Elizabeth Caroline Maria Higho
Gender: Female
Record Type: Baptism
Baptism Date: 23 Dec 1855
Baptism Place: Charterhouse St Thomas, Islington, England
Father: James John Higho
Mother: Elizabeth Higho

image: https://www.ancestry.co.uk/interacti...&usePUBJs=true

They may be related to my ex's Highos, but I can't find any other record. No baptism, marriage or death for James John, no trace on censuses. How can they just vanish?

Any suggestions gratefully received.