I am still confused about which Robert is which.
I also have the 1886 will of Robert provided by Shirley Hogensen. In my database I have this Robert b 1829 as s/o Robt Caine & Christian Faragher who md 1825
I have this Robert as marrying Margaret Garrett in 1852 Braddan and having 7 children.

Robert Caine died 21 Jul 1886 in Braddan and was buried 25 Jul 1886 Patrick

1881 Patrick Ballahigg House
Robert 52 lead miner b Patrick, Margaret 53 b German, Robert 28 lead miner, John 21 lead miner, Philip 14 appt shoemaker, Christian 11 domestic servant, Clara Kennaugh niece 9 scholar b Patrick

Patrick Monumental Inscripstions
New Yard
#216
In loving memory of Robert Cain formerly of Ballaspet who died July 21st 1886 aged 57 years
Also, Margaret beloved wife of the above who died September 4th aged 59 years
Also Philip son of the above who died June 1st 1884 aged 17 years
Also John son of the above who died July 5th 1884 aged 25 years
Also James Cubbon formerly of Gordon Patrick who died October 1905 aged 70 years
Also Catherine Cubbon beloved wife of the above who died January 1922 aged 86 years.

And round and round we go.
DJD