Family History Society

Agnes and Robert Rennie

Could anyone tell me how I can find more info re Agnes and Robert Rennie listed on both 1881 and 1891 census - latter shows them still living in Peel, ages 76 and 80, both born in Ireland. I need to know when they arrived on the Island and details of children and dates of death etc etc. Robert's occupation on the 1881 cenus was Mariner. Thanks...Pat