I don't know that you'd ever find out really. Unless you can find a family connection it may just be one of those things.
Not sure how much info you already have but I've had a quick check of the censuses and in 1891 they are still in Laughton with a daughter - Ethel b.1887. They are in Cottingham, Yorks in 1901. John's occupation is listed as 'Dist Council Surveyor & Inspector'.