This could be the family in 1901, but certificates will confirm:
10 Waterworks Hut, Llanfrynach, Breconshire
Charles Smallman Head age 50 Navvy born Coalport, Shropshire
Maryann Smallman Wife age 34 born Penygroes, Caernarfonshire
Thomas Smallman Son age 18 Railway Brakesman born Penarth, Glam
Jeannette Smallman Dau age 17 born Pencoed, Glam
Annie Smallman Dau age 12 born Llantwit, Glam
Charles Smallman Son age 10 born Cantref, Brecknockshire
William Smallman Son age 6 born Cantref, Brecknockshire
Martha Smallman Dau age 8 born Cantref, Brecknockshire
Maud Smallman Dau age 4 born Barry, Glam
Emily Smallman Dau age 6 Months born Llanfrynach, Brecknock
William Davies Lodger age 51 Navvy
Daniel Bennett Lodger age 60 Navvy
Frederick Foster Lodger age 21 Navvy
John Plase Lodger age 40 Navvy
Thomas Johnstone Lodger age 62 Navvy
John Cody Lodger age 57 Mason's Labourer
Alfred Fletcher Lodger age 35 Navvy
James Edwards Lodger age 37 Timberman
William Foss Lodger age 66 Excavator
Harry Palmer Lodger age 57 Mason's Labourer
RG13 Piece 5169 Folio 6 Page 4
Looks like Maryann is the 2nd wife

There's a marriage of Charles Smallman and Maryann Fosse in 1891
Merthyr T volume 11a page 1043