Hi Gemsgirl,
I have this family living at Haycock's Building, Welshpool in the 1841 census:
Lewis Lewis (40ish) Machine maker
Ann Lewis (35ish)
Lewis Lewis (13)
Ann Lewis (11)
Thomas Lewis (9)
John Lewis (5)
Richard Lewis (2)
Mary Lewis (4m)
In 1851, they have moved to Commercial Road, Llanllwchaiarn, Newtown:
Lewis Lewis (53) Wheelwright & Machine Maker Master b. Shrewsbury
Ann Lewis (48) Wife, b. Berriew, Montg.
Richard Lewis (12) Son, b. Welshpool
Mary Lewis (10) Daughter, b. Welshpool
Lewis Lewis (Junior), now aged 23, and also a Machine Maker, is an Unmarried Lodger at Greenfield St., Greenfield Row, Holywell, Flintshire.
Good luck!
Stan