Here's a possible marriage
Surname First name(s) Spouse District Vol Page
Marriages Dec 1915 (>99%)
Mills David Williams Merthyr T. 11a 1747 Scan available - click to view
Pearce Sarah A Williams Merthyr T. 11a 1747 Scan available - click to view
Williams David J Pearce Merthyr T. 11a 1747 Scan available - click to view
Williams Sarah A Mills Merthyr T. 11a 1747 Scan available - click to view
and here's a couple of Williams/pearce children
Births Sep 1921 (>99%)
Williams Glenys M Pearce Merthyr T. 11a *70* Scan available - click to view
Births Dec 1926 (>99%)
Williams Mavis Pearce Merthyr T. 11a 1248 Scan available - click to view
but I can't find a Nancy anywhere. So I've not taken this as definitive.