"Ein Mann mag seine Töchter."
Translation:A man likes his daughters.
No. In that case, "Mann" would be accusative and it should be "einen Mann". And "Töchter" is plural.
It means that he likes his (another man's=the daughters of another man) daughters. This is not meant in a perverted context. There have been a few cases of incest here in Austria with these sort of things. It may be a play on words. There are a variety of German dialects. There are even quite a few within Germany itself. I have moved here from the U.S.A and I have a hard time understanding Austrians sometimes. The vocabulary is slightly different and the pace at which they speak can be incredibly difficult to follow. In the German of Germany I can distinguish between individual words even though I may not know what they mean. I can tell that there is a slight pause because each word whereas here sometimes all I hear is a gigantic slur.