Good on that family. Me, my brothers, and dad, are of the same train of thought. I've got a teenage sister, who has just finished high school. I've told her, she's free to marry any Somali boy, regardless of clan and region his family originates from back home, but, if she ever brought home an ajnabi of any kind: SHE IS NO LONGER MY SISTER, and will be disowned.
This is how Somali fathers and brothers, should react, when the females of the family bring home a foreigner. No way in hell, will I EVER accept a Madow, Arab, Cadaan, or any other kinds of ajnabi, to marry any female members of my family.