Hello,
A bit of background: I'm half-French, we live in the UK, but both DP and I are fluent in German from study and living there pre-kids.
So we speak German, English and French at home, pretty much in that order.
We read English, German and French books to DS1 and DS2 and also listen to music. English is dominant as we own more English books and get them from school, library and as presents too.
DS1 has just finished Reception and is progressing well with his reading from recognising a few letters when he started to reading short simple early readers.
He asks about different letters in French and German and occassionally I will point out words and say things like - the c/k sound is almost always a K in German. Or you don't pronounce the K in knee but in German you do for Knie.
Is this enough for the moment? We don't have any early reader type books in either language and I'm not sure where to start, but don't want Biff and Chip in translation. All books are bought from amazon and its really hard to find what would be appropriate.