Thank you both Monica and Elisabeth very much indeed.
I found the two William's on A*y when I googled "Michael Penman" "Mary Bauchop"
- the two Williams' parents. I got a few hits but one of them was headed A*Y World Tree Project. Hope this helps. If not, I'll try and send the URL.
I had Michael, Mary, William (1820) and three grandchildren in 1851 to begin with but the SP image gave the eureka

moment ie William was a widower. Of the three grandchildren Michael was 6 and Jean was 4 - Catherine was 19 but we will leave her for now. Michael we know about. He died in 1859 from Typhoid Fever and was William's son by Elizabeth Hardy who died in 1848 - thank you Elisabeth

.
However I think that Jean may not have been William's daughter but his youngest brother Hugh's daughter.
That is because IGI shows rwo extracted births / baptisms:-
Jane Penman born 14th May 1846 Clackmannan Parents Hugh Penman & Jane Nicol.
Jane Hunter Penman born 27th April 1847 Clackmannan Parents William Penman & Elizabeth Bernard.
On census date 1851 (30th March?) Hugh's Jane would have been 4 years old whereas William's Jane would have been 3 years old.
Thanks also Monica for finding Janet Syme ib 1851 in Inverkeithing. I have her birth /baptism in Perth from SP. She was born 1st February 1827. Her parents were John Syme (deceased at baptism) and Janet MacFarlane.
More to resolver

Again thank you both
Regards
Reiver