Separated Family books for 4year old

[AKP79]

Can anyone recommend any books for 4 year olds, which involve step dads or separated families? I've very conscious that some of the books I read to my son talk about mummy and daddy and conventional families.
My son's dad left when he was 3 months and now lives with a new family. I also have a new husband. We're all very happy in our own family environments, so that's not the issue, but I'm sick of the whole mummy and daddy etc.

We have one book with mummy and step dad 'kevin' in it called We're Wearing Out The Naughty Step, but it pisses me off the only book we have that fits the bill is all about being naughty!!

Any ideas??

Harry and his Bucketful of Dinosaurs series, in which Harry lives with his mum, sister and Nan. No mention of a father.

I can think of some that deal with separation/divorce, but must admit I can't bring to mind anything if the sort you're looking for. Gap in the market?

I reckon! There must be millions of people out there wanting something which reflects what is becoming the norm for many families.

I literally cringe when I read some books to him with 'mummy said' and then 'Daddy asked' etc.