Gr 7-10Weekend Sisters doesn't add much to what is already out on the ``blended'' family or the ``yours, mine and ours syndrome , '' but it is good reading. Amanda lives with her mother but spends weekends with her father. She and Fern are thrown together when Fern's mother marries Amanda's father. Although close in age, the girls resent each other. When Amanda's father tries to help Fern, who has become isolated and withdrawn from her mother since her father's death, Amanda resents her even more. After a confrontation, Amanda realizes it would be better if she stayed with her mother while her father and Fern work things out. Colman gives enough descriptive detail to set the mood, but not so much that it's overwhelming. Dialogue flows easily and the plot is believable, with one exception. Amanda's decision to depart the scene for a while so that things can cool down is somewhat of a cop-out. However, that fault is balanced by the characterization of Amanda's mother, who is one of the better moms in current fiction: honest, assertive with her ex-husband without being obnoxious, liberated, warm and humorous. Consider this one if only to balance all the flat, stereotyped parents in so many YA books. Fran Wolfe, J. L. Mann High School, Greenville, S.C.