At a certain point, DNA dissipates. 10 generations back is very hard to track esp in such a homogenous ppl like Somalis.I think immediate family ceeb will not be a significant issue with dna testing in somalia. Rather the more pressing issue would be subclans or reers found out to be assimilated i.e. 10 or so generations ago the ancestor was sheegato for some reason and the lineage was carried on for tens of thousands of people. That is someting i could see starting conflicts