In "Rhapsody in Bloom", a widower's (Silver) sister-in-law (Miller) tends to his children for years only to find the family ties interfering with establishing her own independent identity and life. A light hearted, easy going, romantic comedy which is a little ragged around the edges, "R in B" deals with matters of family, kids, an interloping fiancee, love in bloom, etc. with marginal credibility. A par cable watch for the couch potato in the mood for a no-brainer romcom with kids. (C)