Yaasoob Ezzain is a NK Qaswarah son, out of NK Nada (Adnan x Nashua), a double Salaa El Dine granddaughter, as both Adnan and Nashua are sired by him. On the sire side, NK Qaswarah has three lines to Salaa el Dine and when combined with Nada, a total of five lines to this special horse appear in Yaasoob's pedigree. In tail female, Yaasoob is a Hadban, as he traces through Kamla to Bint Samiha, the dam of Nazeer. This tail female line is also the same line that has produced stallions like Hadban Enzahi (Nazeer x Kamla), Shaarawi (*Morafic x Bint Kamla), the Alaa el Din daughters, Lutfia and Nazeema. Yaasoob has sired four horses selected for the Ezzain breeding program, a colt named Bihnas and three fillies: Radhwaa, Kamilia and Saneiah.