Robert was born in Georgeham ,Devon in 1832 - not 1823
1881 census
Household
Role
Sex
Age
Birthplace
Robert Watts
Head
Male
49
Georgeham, Devon, England
Ann Watts
Wife
Female
40
Newton Nottage, Glamorganshire, Wales
William Watts
Son
Male
14
Newton Nottage, Glamorganshire, Wales
Jane Watts
Daughter
Female
12
Newton Nottage, Glamorganshire, Wales
Rachel Watts
Daughter
Female
10
Newton Nottage, Glamorganshire, Wales
Mary Watts
Daughter
Female
8
Newton Nottage, Glamorganshire, Wales
so - no David Watts - was he born after 1881 - which would be 9 years after the youngest Mary Watts - I will try and get 1891 info