You know these kids are straight; them an' their ol' man's come to work th' Range for wild ones on Rennie's own askin'.
The straight kids' father went to work because Rennie asked him to.  
mnli hypothesis: The straight kids' father went to work because Rennie asked him to.   premise: You know these kids are straight; them an' their ol' man's come to work th' Range for wild ones on Rennie's own askin'.