Getting a bit confused now ! Margaret Kinvig b 1818 md Archibald Clugstone 12 April 1834 Arbory & from your info Una he already had chn to another woman. Archibald died 3 Dec 1838 aged 25 & from what I can see he & Margaret had at least 2 chn before he died - Margaret born 1835 & John born 1838. He had a lot of chn in his short life!
In my notes for this Margaret Kinvig b 1818 (the dau of Richard Kinvig & Eleanor Coole) I had her md to a Henry Welsh in Malew in Feb 1841. I've been checking the 1841 & 1851 census & I find both Margaret & Henry Welsh together , ages tallying, but no Welsh chn & no Clugstone chn at the same address. Now I need help to find out if these 2 Margarets are the same person or one person md first to Clugstone & then to Welsh. Why do the chn disappear ? Thanks for any info to get me to the next level.