Hi Alexis,
Welcome to RootsChat !!
there is a Graig in Ponty(pridd), "up the Graig, in Ponty" pronounced Grige (both G's are hard)
maybe that's the 'Gride'.
Just had a quick look in the 1901 census, there were an awful lot of Devereux in Glamorgan, mostly coal miners, mostly born in various areas near Pontypridd and in the Rhondda.
Mainly Ystradyfodwg and Neath,which is down near Swansea, so unlikely to be your family, although they were probably all related.
Ystradyfodwg is more likely, as it was later annexed to Llantrisant, and the Graig is a "short cut" over the mountain, between Pontypridd and Llantrisant. A big area around Pontypridd is still called Pontypridd, although they are different parishes.
So if they lived near the boundary between Ystradyfodwg and Pontypridd, they could have said they lived in Ponty.
Hope this helps a bit, but probably the biggest help would be if you knew, or could find, a few more names of the families.
Good luck,
Bob
(ex resident of - but not an expert on - Pontypridd and the Rhondda )