What good words can be said to the deceased's family to alleviate their suffering, in addition to Quranic verses and Prophetic hadiths?

Condolence is an encouragement to the afflicted to be patient, a reminder of the reward (from Allah), and a prayer for the deceased. The best words of condolence are those reported from the Prophet (peace and blessings be upon him): "Indeed, to Allah belongs what He has taken, and to Him belongs what He has given, and everything with Him is for an appointed term, so be patient and seek your reward (from Allah)." It is permissible to use other phrases such as: "May Allah magnify your reward, and may Allah improve your solace, and may He forgive your deceased," as long as they do not contain anything Islamically forbidden.