do you know if he fathered anymore children in Newport
If you look on Freebmd.org.uk you can see some Derraven/Anstice births
There is quite a gap between them so you would have to get the images to see if they were the right parents.
Especially as some of them are after death of Charles .
But the 1929 one might be worth following upon
Unfortunately none are available as the cheaper digital images.
Also the birth of Ivor Anstice in 1926. He married & died as Derraven
The poster on the 2008 post is connected to him.
There are two births in Pontypool that look as though they could be his children.