I'm really sad to hear that as I know how it feels being a Thal and to lose your father. My world became upside down as my father was the only one who supported the family and managed my treatment.
All I can say to Ayesha and Salman is to have courage and be strong. Take good care of yourselves especially your mom. Be strong in front of your mom as you are the strength of the family now.
May God Almighty give your father a high rank in paradise.