Meet the Radish — Jean Ure

The second book in Jean Ure's Foster Family series. Abi and Sam are going to have a brother. They're not keen on boys, but little Gus is adorable. He's only six, with a crop of carrot red hair - Sam and Abi call him 'the Radish'. Gus is shy and really timid, but pretty soon the girls can't imagine life without him. Then his real mum turns up and spoils everything!