I am hoping we might be onto something then. Here's the family in 1871:
White house, Forden.
Edward Williams h 35 Ag lab Berriew
Mary Williams w 46 Salop
Margaret d 14 Forden
Mary d 12 "
Anne d 10 Salop
Elizabeth 8 "
Sarah d 6 Forden
Emma d 4 "
Martha d 2 "
Edward s 11mths "
More than 6 sisters there, but still, all girls.
I can't find a Joseph Williams, father Edward.
Nearest I can do, 1881 RG11/5492/78/22
White House, Forden - all born Berriew, which is about 7 miles from Forden, and about 5 miles from Welshpool. Forden to Welshpool is about 5 miles. They all sit in a triangle.
Edward Williams 48, ag lab
Mary 50
Annie 21
Elizabeth 19
Martha 13
Edward 11
Fanny 6
If born in Welshpool/Forden the registration district looks as though it would be Montgomery. There is an Edward Williams born June 1870 Montgomery 11b 240.
There are no records Montgomery for a Joseph Williams. It's going to be a bit tricky, I think. Forden records were started Sept 1870, prior to that it's Montgomery. Searching years used, 1870 to 1872
1891 - RG12 Piece 4595 Folio 23 Page 6 in Montgomery - Still Edward
Edward Williams 21, farm serv, b White House, Forden
1891 - Parents/some family are same place, White House, Forden.... RG12 Piece 4596 Folio 128 Page 12
Cas