The parishes of Our Lady of Czestochowa in Cheektowaga and Saint Bernard in Buffalo were linked together in the Fall of 2015, in accordance with the Journey in Faith & Grace. The parishes operate independently. Although with a great deal (and increasing instances) of collaboration.
While some day the parish councils may come together to write a joint Mission Statement, it may be difficult to improve on the one that we can find in Matthew:
Going therefore, teach ye all nations: baptizing them in the name of the Father and of the Son and of the Holy Ghost. Teaching them to observe all things whatsoever I have commanded you. And behold I am with you all days, even to the consummation of the world. Mt. 28: 19-20.