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Which is the correct way to enter when moms were unknown in Close Relatives:
- add a child to create a single parent family, OR
- add brother?
If you can not confirm, or even suspect with a preponderance of evidence, that the mother was the same, then you should record each child in a separate family and merge later if/when you do confirm the data.
When neither the father nor the mother are known, but you DO know that the two individuals were brother and sister, then you should simply add the brother to the sister or vice-versa. This should create a family with no mother or father.