That’s BS I have cousins who are half Somali(paternally) and half Arab(maternally) and speak perfect Somali.
The culture identity comes from exposure for example my cousins would regularly visit his Uncles/Aunties who spoke Somali and they’d go every Summer to Hargeisa and Burco because they love the weather and people.
Who taught them Somali?
Can they speak Arabic as well?
Is there Somali really good, or a couple of sentences here or there?