Sometime ago, I found a John Crawford in 1880 in New Jersey, age 34, cooper, from Scotland with wife Eliza 38 from England, with daughter Agnes age 8 born New Jersey. When I found the record, I didn't know about Eliza Boatfield/Botfield. Now I am thinking this is possibly them, living together as man and wife, long before their legal marriage in 1892.
But is Agnes John's daughter or Eliza's from a previous relationship. Agnes would be born 1872 and John supposedly emigrated 1874 if we found the right couple in 1900 and if the emigration year is correct which it may not be. In 1900, if we found the right couple, they have been married 19 years and Eliza has had 2 children, none living. Eliza's age is probably 10 years out in 1900.
John is age reportedly age 45 in 1892 when he married and Eliza is 48. I think the ages are close enough to be the same couple. Several of John's siblings were coopers.