Rae and Erik Smith are looking for a multi-generational home to fit their newborn Tristan as well as Rae's mother in Oahu. Hawaii Life realtor Caron Ling shows the family three Oahu properties with 'Ohana' units: a separate space or guest cottage referred to on the mainland as a 'mother-in-law suite.' The Smith's tight price range makes finding the perfect home a difficult proposition.