OK now we have (sorry but thinking aloud here again)
Frances JENNINGS 1814 and a possible Eliza JENNINGS 1816 who both married two HEDGES brothers.
Tell me if I am correct here...
We now have a Joseph JENNINGS 1806 who is a possible brother to Frances JENNINGS 1814
Joseph has his widowed mother Sarah JENNINGS 1775 with him in the 1851 census.
Just let me know if I get anything wrong, don't want to get confused. It's so easy these days.