What is the reward for one who gives charity for the sake of Allah, and how is charity given if one is uncertain about the recipient's worthiness, and is charity to family members sufficient?

Charity (Sadaqah) is an act of worship with immense reward. Among its proofs is the Hadith Qudsi: "Whoever gives charity equal to a date from a good earning... Allah accepts it with His right hand, then He develops it for its owner... until it becomes like a mountain." Charity has many benefits: it protects against bad fates, wards off affliction, extinguishes sins, preserves wealth, brings sustenance, gladdens the heart, necessitates trust in Allah, purifies the soul, endears the servant to Allah and His creation, conceals shortcomings, increases lifespan, elicits people's prayers and love, repels the torment of the grave, becomes a shade on the Day of Resurrection, intercedes with Allah, eases the hardships of this world and the Hereafter, and encourages righteous deeds. The reward of charity is magnified by keeping it secret, by giving it to someone in dire need, and by giving it while in good health. Charity is permissible for family and relatives, and it may even be superior, even if they are wealthy, as the Prophet (peace be upon him) said: "Charity given to a poor person is charity, and it is two (rewards) for a relative: charity and maintaining kinship ties." However, if someone poorer than one's family is found, then giving charity to that person is better. Charity is performed by giving money directly to the needy, or by sending it to the poor in Islamic lands if there are no poor people in one's country of residence, or by giving it to an Islamic center that undertakes its distribution.