Averil, I think William Looney's wife was Margaret CORKILL:
Did you have this bapt?
Daniel Illegit son of William Looney & Margaret Corkill bapt Parish Church Maughold 24 Mar 1734/35.
- But he was bapt earlier than the twin you mentioned. There was no mother given at the twins' 1747 bapts (no "Margaret") - only father William Looney. The same at the later bapts of their brothers Robert and William [2].
The other children of William Looney and Margaret Corkill (as well as eldest son Daniel born pre-marriage) look like:
Peter [son of] William Looney/ Margaret [bapt]Parish Church 12 Feb 1735/36
John William Looney/ Margaret Parish Church 1 May 1738
Margaret William Looney/ Margaret Parish Church 10 Aug 1740
Isabel William Loony/ Margaret Parish Church 2 Oct 1743
Joney William Looney/ Margaret Corkill Parish Church 20 Apr 1746
Sue