Article is decent and contains the Geledi version of the arab fathers legend. The four brothers, Cumardiin, Fakhruddiin, Shamsuddiin and Jamaluddiin. (Diin wasn't the father of the four brothers, it's the second part of the name).
The article is extremely confused though, Geledi is Cumardiin not Fakhruddiin, and Garsoguude is a Geledi subclan not a different clan, and the Geledi did not settle at Afgoye until the 18th century when they conquered it from the Silcis.
Fakhruddiin is the man of the same name who founded the Mogadishu Sultanate. Shamsuddiin and Jamaluddiin are also the two brothers who founded the Adal Sultanate, there is no Lamu Sultanate there was a Pate sultanate but it had no ruler named Jamaluddiin. There is no evidence outside of the Geledi legend that these men are related other than the similar name.
They have the title Garaad because they were originally governors under the Ajuuraan, Garaad is an administrative title used by the Adal and Ajuuraan empires.
The four brothers legend is kind of like the seven brothers of Haasa legend in Zenj histories,
Author did not do enough research.