yes there is a Robt born to Robt + 2nd wife who is under age (I suspect Robt senr was getting on a bit) - and this Robt junr is still on Island in 1720's as I think he marries Jane Kneale and seems to dispose of some of the Ballasalla properties. The query I have is the Francis Looney (who also appears in the 1704 composition book) - suspect he if offspring of some uncle (gt uncle) who moved to Belfast)
In one of the deeds a Ballasalla property has both Abbey and Lords rent - Lords rent is generally easier to research and I have a copy of the 1756 to 1701 lib vas