Steve,
TWINS
You need to distinguish ...
... identical twins;
[Cause: A single zygote splitting apart during the early differentiation process.
Such is considered an "accidental" happening - not an hereditary trait.]
... non-identical twins.
[Cause: A simultaneous release of multiple eggs.
Such is known to be a female hereditary trait.]
Scientific investigations currently conclude that the male contribution to the creation of the next generation has no measurably significant influence on any tendency to produce multiple embryos in the female's body.
During the 19thC "the development of the human embryo" was known as "Evolution"!
James KIRKPATRICK & Margaret KIRKPATRICK, twin offspring of William KIRKPATRICK of Ballywye,
were baptised on 20-MAR-1811.
James KIRKPATRICK, son of William KIRKPATRICK of Newmill,
was baptised on 10-JUN-1812.
Mary KIRKPATRICK, daughter of William KIRKPATRICK of Newmills,
was baptised 16-AUG-1813.
[The above baptisms were all performed by The Revd. Henry COOKE, a famous character!]
----
Melodien,
I searched the recently transcribed 5,300 baptismal records for Donegore 1st Pb at Parkgate.
No joy on James MOORE b. ~ 1817.
Nor on Jane KIRKPATRICK b. ~ 1819.
No matches for any offspring of James MOORE & Jane KIRKPATRICK.
A Mary Jane MOORE, daughter of Robert MOORE and Margaret Wilhemina CONNELL of Ballywee,
was born 20-NOV-1854 & baptised on 22-JAN-1855 by The Revd. W. J. GILLESPIE.
Perhaps you need to search further East, in to Kilbride parish ...
Capt. Jock