The cast of Allein - 2002 includes: Manfred Reiter as The child
Katharina Schett as The girl Michael Tschapeller as The boy
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Barbara is the mother of your daughter's mother. That means that
you are married to Barbara's daughter..which makes you her husband.
Therefore you are the son-in-law of Barbara.
You could also be Barbara's daughter. Barbara is the
grandmother.