I've done a bit more diiging and think I can n ow confirm a few things related to your previous posts.
The 1861 census shows William Wotherspoon, age 43,living at 100 Glasgow Road, Crofshill, Baillieston alons with his wife Janet (age 42), son William (age 18), daughters Jane (age 15)and Janet (age13? - text is a bit illegible), son John (age8) and daughters Elizabeth (age 4) and Marion (age 1).A big family.
I found a record of birth for James Wotherspoon to William and Janet (nee Kerr) Wotherspoon on 3/5/1851.I assume that James died prior to the 1861 census, but can't find this record. Marion dies young on 11/3/1867.
The 1851 census shows William and Janet living in Crofshill along with Donald (Janet's son through another relationship), William, Jane and Janet.
Now, there is a death dcertificate for A William Wotherspoon on 16 July 1861 age43.The death is recorded in the district of "High Church" in Glasgow but records William's usual residence as Baillieston, Glasgow.It also states that he was married to Janet Kerr. From this I have taken it that this is the same William.The death certificate is signed by his brother Robert (this is the same Robert as in your tree I think).
Now the bit that I think is causing the confusion is that his death ceriticate also records his parents as William Wotherspoon and Janet Kerr.Could it be that the son witht he same name as his father married a woman with the same name (forename and maiden name) as his mother?There is a record of a birth of a William Wotherspoon to William and Janet (nee Kerr) Wotherspoon on 5 January 1817 (I have sent off for a copy of this as it is not visible on the database).This would tie it in.
William's death, apparently immediately after the 1861 census, would appear to have fragmented the family as in the 1871 census Janet is still living in Crofshill, Baillieston with William, Jane and John with a grandson also called John (aged 5 months).This is Jane's first illegitimate son. I am still trying to track other family members whereabouts in the 1871 census.
Hope this is all of interest and correct!My best guess is that we are distant relations and I also think that the Kier in Donna's post is actually Kerr as well?