Hi,
I found a site that at least mentions David and Mary Ann
http://cowen-ent.co.uk/getperson.php?personID=I2091&tree...

It says David was born in Darwen, Lancashire, England and Mary Ann was born in Liverpool and they were married in Bolton Lancashire in 1892 so they would have arrived in Canada after that. They were in the 1901 Census in England and in the 1906 census in Canada.