Lebanese singer and musical icon Fairouz made a rare public outing with her three surviving children on Tuesday. The 87-year-old singer attended an annual mass in remembrance of her once husband and father of her children, composer Assi Rahbani, with her sons Hali and Ziad and daughter Reema. Hali Rahbani, who has mental and physical disabilities, is rarely seen in public. “He does not talk, does not hear, does not walk,” Reema said of Hali in a Facebook post with photos from the outing shared Wednesday. Like his father, Ziad Rahbani is a famous composer. Assi Rahbani died in 1986 aged 63, aft…