sisters is in a different hand - possibly done at court as otherwise the two women were just named without any relationship and they were sisters to the exor;
On the marriage 30 Oct 1802 Wm Corkil - Eleanor Christian - the witnesses were Edward Corkill (who I suspect was Parish Clerk) as he witnesses several other marriages that year and a William Corkill so not much help there tho worth noting that Wm (the groom) signs whereas Eleanor has X (I looked at actual Register whilst in Library today)