Hi, Perhaps a little more information would help others help you. with your quest.
What time frame are you rsearching ?
When wre your possible GGrandparents :
Robert and May HENDERSON in Moose Jaw Saskatchewan.
What were your Grandparents names [Chilren of Robert and May Henderson]?
What research have you already done? to lead you to the names of Robert and May HENDERSON ?
Do you know if they are Deceaswed?
If So When? Where?
Obituaries may help to connect with known family members.
Do you know the occupation?