following your advice I contacted Sue at the Mt. Pleasant Cemetery.
She confirmed Harry Catlows Grave was indeed there in Section 08, Lot 8295
If you are passing by could you have a look for me and possibly take a digital photo. I appreciate its a lot to ask but I would be forever grateful. She also confined the following
Catlow, Harry, 55 yrs of age, DOD January 16, 1930, interred January 18, 1930
Mrs. Frances Catlow purchased his grave, but she is not interred there
However has no records of the other members of the family so I guess they are buried elsewhere. I have asked Sue for a list of cemeteries and contact details if she has them. I suppose it is possible that they moved elsewhere in Canada, the USA or even back to the UK but I cannot trace them at present, and without married surnames for Jessie and Sarah I think my search may end here. I am going to try the pages of the past which someone else mentioned might give me marriage information.