Musannaf Ibn Abi Shaybah 12208 — A man whose polytheist relative dies

Sa'id bin Jubayr said: A Christian man died, and he had a Muslim son who did not attend his funeral. Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) said: "It was proper for him to go along with his father's funeral, bury him, and seek forgiveness for him during his (the father's) lifetime."