From Coronation Street Wiki
The residents rally round as Ken goes in search of the twins. They help search the fairground. Maggie's sister Betty Turpin arrives, telling Maggie she's come to look after her. The police take over the search as Val breaks down. Mrs Allendale brings the twins back after finding them and giving them their teas. Maggie has to stop Val from going for her. Hilda finds two library books, overdue by five years. Maggie fears Betty will take over her life. Elsie gives Jack £300 to give to Len, in his name, not hers.
This episode was included on the 1969 disc of the Network DVD collection Coronation Street: The 1960s, released in 2006.