A room collapsing and killing the father

A: If the reality is as you have mentioned, you will be liable to the Kaffarah (expiation) of accidental killing as you caused your father's death. Actually, he fell down into the deep room because you struck its ceiling. Moreover, the wreckage plain your father was sitting on collapsed and fell down into the room as a result. The Kaffarah is to free a Muslim slave or, if this is not feasible, to fast for two consecutive months, i.e. sixty days, for causing accidental killing.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.