Here's an excerpt from the website:
So please, check it out and see what you think!
Our new name is taken from the papal encyclical Mater et Magistra, which
explains the Church’s role as our mother and teacher. In our homes—our
domestic churches—we, too, are “mother and teacher” to the children in our care,
a special blending of the God-given duty to educate our children.
We have made our title in lower case letters in deference to the “big” Mater et
Magistra, the Church, and we take as our model the most beautiful mother and
teacher ever created, Mary, the Mother of God.