Hello Mev
There is no luck on the Llandefaelog Bowcots as I suspected so I am going to concentrate on John Bowcott but most probably you already have the information and I must emphasise that it is only my interpretation of the tree which is not very clear.
John Bowcott born 2nd. March 1794 @ Alltmawr son of Richard Bowott (1763 - 1836)(I have a list of John's siblings but am not going to mention them unless you want to know)
John Married 29 May 1823 Ann Jones of Maemynis.
On the tree is list which I have interpretated as being the source of information:-
1841 Census Alltmawr
1851 Cendsus Llangenny, Crickhowell
1861 Census ?
1871 Census Llanfihangel Ystern Lewern, Mon
1812 Mentioned in g.fathers will
1816 - do - father's will
1858 - do brother Thomas's will
Died June 1875 aged 83
Wife Died Dec 1879
John and Ann Issue seam to be:-
Jane Bapt. 22 Mar 1824 Alltmawr 1841 Census Altmawr (15)
Richard 1 Feb 1826 - do - (15)
Ann 5 Mar 1828 - do - (13)
Mary Bp. 16 Jan 1831 - do - (10) and 1851 Llangenny (20)
Margaret Bap 19 May 1833 - do - (

1851 Llangenny (17)
All at Alltmawr
Margaret died June 1884 agee 48 - Monmouth
Source List with a No. which I don't understand may be age
There is a second group namely
Eliza Bap 28 June @ Alltmawr 1841 Census for Alltmawr (5)
1851 Llangenny (15)
John Bap 23 Aug 1837 Alltmawr 1841 Census Allmawr (3)
Thomas Bap. 23 Oct 1840 1841 Census 6 mths
1851 Census Llangenny (10) 1861 Census ?? Married by 1871 Census to Sarah 1871 Census Monmouth 28
(The tree then appears to give their issue but ask if you want info (Continuing with Thos - 1881 Census Monmouth (38)
1891 Census Mon. (48) Died a widower 23 Nov. 1912 @ The Warra, Raglan Mon
Catherine Bowcott born circa 1844\5 1851 Censu Llangenny (6)
William Bowcott born 20 Mar 1846 1851 Census Llangenny (5) 1871 Census Mon. (23) 1881 Census Mon (34) 1891 Census Mon (42)
I hope that this may be of some use
Best Wishes Oliviv