Listmania!
The best siblings books ever!
Sassy: Becomes a SisterSassy: Becomes a Sister by Kate Evans
Buy new: £3.99
Helps children cope with having a sibling with an illness. Independently published but is very much available.
I'm a Big SisterI'm a Big Sister by Joanna Cole
Buy new: £3.63 / Used from: £0.01
A positive look at being a big sister.
I'm the Big Sister (There's a Brand-New Baby at Our House and...)I'm the Big Sister (There's a Brand-New Baby at Our House and...) by Susan Ligon
Buy used from: £9.95
Another great big sister point of view.