Thanks Wendy, I guess there could be quite a few similar incidents. It has certainly made me check out all the siblings carefully, bmds,and census. There does not appear to be any more entries for Dennis b 1842. I've double checked census details today for Michael and the date fits 1871, 1881, 1891 and 1901. ( This last was under Greedon). Certainly his son my Grandad never used Dennis for his father but the death certificate says 77yrs in 1919 Michael Dennis. I begin to feel 95% happy about him. Still hopeful a baptism entry might throw light on it. Maybe he was only called Dennis for a week at birth! Thanks Valerie