"Thank you all for your fine effort. First some questions:
1. where is Anthony St Mary?
2. William buried in 1859 would make him 58 not 51 as recorded. Their mistake?
3. Who is Henry, buried? I suppose a relative of little interest to me."
1. St Anthony and St Mary are the names of the Churches
https://en.wikipedia.org/wiki/Priory_Church_of_St_Anthony,_Lentonhttps://en.wikipedia.org/wiki/St_Mary%27s_Church,_Arnold2. Age at death can very often be wrong, depends on the knowledge of the person registering it, both the Death registration and the burial record have his age as 51.
3.Henry was buried aged 10 weeks, his abode Bestwood Park, is of interest, as the family were residing there on the 1851 census. Any and all little clues are of interest, as they can turn out to be very valuable later on.
"Finally, what do you mean "probablys" and "unknowns"?"
Your words in the opening question"William Jackson born Lenton, Notts
died. unknown, probably 1860
wife Sarah Wright born 1801 Bulwell, Notts
married 1825, probably
died unknown"
Baptism St Firmin Church, Thurlby by Bourne
William Jackson born 29 May 1807 baptised 14 June 1807
Parents William & Mary
( Thurlby?? Thorsby??)
Also, as has already been asked. Where did you get the surname Wright from for Sarah?