Rebecca and George's last child Joshua was born c. 1846, so it's highly unlikely that Rebecca was born as early as 1796. Also, she is very consistent with a birth year of around 1809 in every census, and her burial record at St John Dodworth on 17 April 1878 gives her age as 69, which also matches.
George Holden is recorded as age 50 on his burial record 11 Apr 1858, also Dodworth St John, so they were about the same age.
Joshua Crawshaw married Ann Hattersley 17 March 1789. They had quite a lot of children:
George 1790
Richard 1795
Rebecca 1794
John 1799
Ann 1800
Robert 1803
David 1805
Isaac 1807
Elizabeth 1809
Isaac 1811
I can't see a burial for the first Isaac, or any other record for the 1794 Rebecca.
I think the first Rebecca probably died. Maybe Elizabeth, born in the right year, became known as Rebecca later, or there could even be a mistake in the register! George and Rebecca did have children Joshua and Ann, so they do look likely parents for her.
I think you need to follow up other members of both families and see if there are any further clues. Is there a marriage or burial for Elizabeth for example? Are there any wills? Ann Hattersley the marriage witness might well be a cousin.
All this from Ancestry by the way, and you clearly have access so need to work through the possibilities before coming to a conclusion, which might well be on the balance of probabilities if there isn't a baptism.
Anne
