I was just checking for any baptisms for the children of William & Margaret, but nothing showing even though Llangranog baptisms are on one of the main sites.
If you're going to order a birth cert, your best bet would be to go for one of the children with a less common name first name as Evans is not unusual in the area or where you can be more sure of their age. So, on the 1871 census there's a Sarah M who is 5 months old, this registration more than likely
Sarah Miriam Evans dec qtr 1870 Newcastle Emlyn vol 11b pg 21
or
David Elias Evans sept qtr 1868 Newcastle Emlyn vol 11b pg 20
or
William Owen Evans march qtr 1872 Newcastle Emlyn vol 11b pg 32
I don't know where in the world you are. If you're ordering from outside the UK, order from the GRO as they're the cheapest anyway & there's no charge for postage,
https://www.gro.gov.uk/gro/content/certificates/You can order direct from the registrars in Cardigan, but they may need SAEs.
Hope this helps and post on this thread when you find out her maiden name if you need help to find the marriage registration.
Mabel, that could explain why he moved to Llangoedmore to farm & in a later census was the man from the Pru!
