The MacGregor Grooms (English, Paperback, Nora Roberts)

It worked with his granddaughters. Now Daniel MacGregor, powerful patriarch of the MacGregor clan, wants to see his three handsome, eligible—but stubbornly single—grandsons married. So he’s found just the women to tempt, tease and torture D.C., Duncan and Ian all the way to the altar. And you can bet Daniel will be sitting by with his feet up, a glass of whiskey in hand, smugly watching his plans unfold . . .
Source- Goodreads.com