I know this is an old post, but I am very interested in this family. Joseph Grimshaw (who married Jane Bamber), son of Joseph and Peggy is my 3 x gt grandfather. Joseph junior's daughter Hannah married Blake Jepson and this is my line. I wonder if you have found any more info going back?
Also, there is a curious bastardy case involving Blake, and a Susan Walmsley (possibly cousin of Hannah?). It appears Susan later married William Walmsley, Hannah's brother. I am still trying to sort this out.
I haven't used Rootschat much - I don't think I am allowed to send PMs yet, so hope you will reply on here