Hi Alan. I have only found 1 child for John James Cain and Emma Wilmott,=Emma Gertrude Wilmott born 6-9-1898 died 19-12-1898 aged 14 weeks,she was born before they married hence the surname Wilmott.
Brian Lawsons site says fathers name not given. Emma Wilmotts sister Annie Beatrice married my Great Uncle William Wallace Corris in 1891.
Regards Kay.