Does the reward of my deceased father cease when the mosque he built is demolished to be rebuilt?

If the first mosque is spacious and suitable, it is not permissible to demolish it or sell it, nor to build a mosque close to it, unless its replacement is permissible. It is permissible to demolish a mosque for the purpose of expanding it. If a mosque is demolished unlawfully, it must be rebuilt.

The demolished mosque remains under its endowment (waqf), and the reward of its endower (waqif) continues as long as his intention was for Muslims to benefit from it perpetually. If the land of the mosque is endowed, its reward remains as an ongoing charity (sadaqah jariyah). If the mosque is rebuilt using materials from the old mosque (bricks, wood), some of the reward remains for the endower of the first mosque.

If an endowed property collapses, its materials should be used for its reconstruction to preserve it. If they are not immediately needed, they should be reserved for future need. If it is impossible to restore its original form, it should be sold, and its price used for its reconstruction.