...have kids that look nothing like each other? Wallahi it blows my mind how you have Somali siblings that look like different races.
For example, in my fam, my brother looks blasian, my sister looks north African, and I look more typically Somali, but get mistaken for Indian sometimes too. And I know this one family, two kids look mixed with cadaan (very lightskinned), another kid is really darkskinned and kinda looks Bantu, one looks Habesha, and another looks Latino. And they all have the same mother and father. Also see this with a lot of other Somali families (albeit not as extreme as the last example).
How did this happen?
I get that each child has a different gene combination/expression of traits from their parents, but most siblings of other races look at least somewhat alike.

How did this happen?
