All three burials are entered in the Parish burial register, Ellen and William on page 194 and James on page 258, and these records are held at Gwent Archives, Ebbw Vale. Unfortunately there is no grave location indicated. I have taken a look at the Memorial Inscription transcriptions, also at Ebbw Vale, but sorry to report that there are no Miskell's entered. This could indicate that they are buried in an unmarked grave. There is a possibility that the gravediggers book still exists and is still with them. The only other avenue is to ring CCBC bereavement services on :- 01495 235189/235225.
Good Luck,
Gerry