You may ease their life by feeding their mother and creating some sort of a sleeping crate for the feline family out of old fruit crate upholstered with old cloth. (snowyswan.com)
That's a vintage fruit crate I got at a yard sale for $ 10! (thedomesticheart.com)
Firstly, find an old wooden fruit crate and give it a coat of wood stain. (idealhome.co.uk)