Holy woman and children

I have what I think is an original pastel circa 1900 - 1920.  The woman is blond and has a halo around her head.  The two children are cherub-like and also blond.  The woman is wearing a red cloak.  The child in her arms on left side has a halo as well and is an infant with white blond hair.  the child at her knee on her right side has no halo and his or her hair is darker and curly.  the background is a country scene - rather sparse.  Low hills and rocks, perhaps a river. 

This belonged to my grandmother and I'm guessing at the age because most of the artwork she had was around 1900's to 1920's. 

The signature is E~S with no other markings. 

I'd appreciate any information you could give me regarding this painting/pastel.

Thanks