Right, one thing at a time.
1.
This is the family in 1881:
Old Toll House, Ruthin Road, Wrexham (Abbot) RG11/5518/127 page 29/30
John Thomas, 33, warehouse clerk,
Mathilda, 31
Martha, 10
William, 7
Sarah, 2
Estol(?), 11mths
all down as b. Liverpool
2.
North Wales BMD has a civil marriage in Wrexham for William to Mary Brodigan in 1896.
3.
1901
Pentrellwygadd, Marchwiel
RG13/5215 Folio 57 Page 10
William Thomas, 26, shift man at colliery, b. Liverpool
Mary, 27, b. Ireland
John, 3, b. Wrexham
Richard Turner, cousin, unm?, 21, shift man at colliery, b. Ruabon
HarrietTurner, cousin, 18 unm?, b. Wrexham
It looks as if Richard and Harriet were,maybe, Mary's cousins from this - children of your ancestor and Llewellyn Turner.
Gadget