50s or earlier children's book featuring boy twins (not The Bobbsey Twins)

My mother recalls, when she was very young, reading a children's book featuring twin boys.

The book must have been published in the early 50s or prior.

One twin boy always wore red shorts and the other twin boy always wore blue shorts.

My ma swears it's not The Bobbsey Twins.

Yes, my ma fully admits that it is very possible she dreamed the above.