But again, the situation would be literally no better without a fourth cousin relationship. The fact that the couple may be fourth cousins is a total red herring, it's got nothing to do with what's wrong with that situation. Yes, a familial relationship is often an aspect of an organised marriage, but selling someone to another family for a dowry with no blood relationship between the couple of any degree is exactly the same as between fourth cousins. I don't know why you are bringing the single shared pair of great, great, great grandparents into the scenario, it simply isn't significant in any way.