Looking for Family of John O Owen IN Iowa USA

My grandfather, John O. Owen, went to Red Oak,? Iowa, USA, 1906; to
his brothers, Evan and Dafydd(David). He then came to Canada. Evan
and David had families there. My dad remembers a son of one brother
coming for a visit. We lived at Ponoka, Alberta, Canada.

Is there any of the family left there.