I'm easily confused, Angela...this could be a bit of a rabbithole ( Can't choose an emoji as they all look the same with Xmas caps)
Your query states "My Great x 5 Grandfather was born in c1746 " but also that you're looking down the wrong branch for your Wm./ as you had the parents "completely wrong". So, to confirm... it is the parents you're not sure of... ?
What did you discover that proved William’s parents, brothers and sisters "completely" wrong?
Thanks ever so much for all your help, I read a copy of Robert Baker Girdlestones published genealogical notes and when I found William Girdlestone my 5 x grandfather (who I believed to be my relation) on a family tree diagram included in the notes, his wife's name did not match my great x5 grandmother’s name. I looked at my tree and I had him married to my relation and the lady on the family tree diagram but the marriages and children crossed over so it cannot possibly be right. My Great x 4 Grandfather also called William did not descend from Williams wife as mentioned on the diagram.Many people have the exact same mistake on their tree on Ancestry and have one William Girdlestone married to two women and having children with both at the same time. so I am trying to discover who my William’s parents actually were as they are not Zurishaddai and Sarah. I have my William’s children listed as Sophia, Mary, William, George, Harriet and Elizabeth. I actually found an old post on another family history site with someone else with the exact same issue whose post might explain it better than I can… it is so hard to put into words 🤯
https://www.british-genealogy.com/forum/archive/index.php/t-75440.html?s=ffd9fbf0a2a8a01bebb168998b3698d9