Is it possible to sponsor a child who has lost his father through an orphan sponsorship program, or is that exclusively for an orphan who has lost both parents?

An orphan is one whose father died before he reached puberty (the age of fifteen or the onset of signs of puberty). One whose father is lost and whose death is not confirmed is not considered an orphan until his death is ascertained or a period of time has passed during which he would not normally live, and this is subject to the discretion of the ruler. This child can be helped with zakat and charity if he is poor, but the rulings regarding orphan sponsorship do not apply to him.