thomasker2 is correct, in order to give you some help, you need to give a bigger picture of the family unit.
>>I've written to all the Catholic dioceses in Michigan....nothing.<<
If the query is too generalized, it's ignored, they simply don't have the time and volunteer base to do generalized searches.
You need to pinpoint an area at a specific time. Where was this family in the 1880 census?