Donna, all I have is a tidbit on the very bottom of Patrick Gelling's 1708 will (transcribed) which has the following:

"KK Braddan Feb 7th 1736:
Paul Gellin, Jane Gelling & Esther
Gellin came this day before me
& acknowledged that they received
from their step father Dan: Cain[?]
of Douglass the sum of four pounds
nineteen shills and seven pence
in full of all accnts for what
was due unto them by the Will
of their Father Pat. Gellin w’ch
acknowledgmt is to be annexed
to the said will."

There isn't a marriage in the IGI for them.

There are potential burials and wills for both Daniel Cain(e) and for Margaret Cain(e), one of which is about 6 months after the above acknowledgement with the alias "Kinnish".

I'm not much help here, I'm afraid.