Thank you, Sue and Frances for these replies.

Sue, Caroline becomes more mysterious. You have confirmed that it was her that married John Kinrade in 1874. One might have thought it was to gain a man to look after her and her young daughter Mary Jane Callow, who nevertheless is with her grandparents in the country back in Maughold in 1881. It looks rather that Caroline was providing a new mother for John Kinrade and his daughter Ada, who was born in Maughold. On marriage she went to Dalton in Lancashire, where he was mining, and where their first child together was born, in 1876/7, before returning to Ramsey, where there next child was born. Also, they could take in his old Mum from Lonan, remarried to a Kermeen and since widowed.

The mystery is Mary Jane Callow, said to be 5 at the 1881 census, implying a birth date of 1875/6. That was after her mother had remarried. I couldn’t find a Mary Jane of about the right age, either Callow or Kinrade, in the IGI. Her father couldn’t have been William Callow, for he was dead by the time of the 1871 census. Any thoughts?