Debra,
This should be doable but it is subject to the discretion of the pastor.
There is a potential issue of scandal if people see that you are living together, aren't married, and don't know that you're living as brother and sister and yet are receiving Holy Communion.
All of this has to be worked out through your parish.
The same goes with your children's Baptism. If you can reassure your pastor (or whoever is baptizing your children) that they will be raised Catholic, it is unlikely to be an issue.
Eric
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