Search - West Texas Weddings ( The West Texans, Bk 2) (Harlequin Superromance, No 730)

The best man for the job. That's Morgan Hughes. A field inspector for the Texas Cattleman's Association, he's a cattle rustler's nightmare and every woman's dream. Now he's been asked three favors by his good friend Rafe Parker: to be best man at Rafe's wedding, to take over as temporary foreman of the Parker family's ranch and to investigate a mysterious woman name Christine Grant.
Seems that the lovely Christine and her eight-year-old daughter have just arrived at the Parker Ranch with illusions of having inherited shares in it. But only family members can inherit, and Christine and her daughter are no Parkers. Or are they?
Morgan aims to find out- and quickly. Before he does something stupid like asking Rafe to be best man at his wedding...

Good series, for Texas and cowboy stories. Chambers built a good family.