The Exiles (there are three books altogether), like the Casson books, features a family of mostly girls -- the four Conroy sisters. In this first book, they are dispatched to Big Grandma's house for the holidays while their home is being renovated. Various misadventures ensue, culminating in... [spoilers which may or may not involve a fire where books are destroyed -- this part was hard to read!]
This was a sweet book. I had a bit of trouble telling the four girls apart; their personalities are not as clearly delineated as in the Casson books, in fact this feels like a rehearsal for McKay's later, more accomplished work. It also lacks the emotional heft of the Casson series. But it's a light, funny read.
One thing that dated the book was the fuss made about the sisters' allegedly 'weird' names: Ruth, Naomi, Rachel and especially Phoebe. Well, Phoebe might have been slightly unusual in 1991 (not to me, as I have an English cousin called Phoebe), but it certainly isn't peculiar these days -- perhaps helped by the arrival of Phoebe from Friends. Naming trends come and go, and by all means use your favourite unusual names on your characters, but best not to comment on it at much length. Who knows, the popularity of your character may propel that 'bizarre' name into the Top 10! (Unlikely but it has happened -- babies are actually being named Renesmee now, believe it or not.) I still live in hope of a wave of little Calwyns one day...