'Go back to them, and make them happy as you have saddened them.'(Abu Dawood) *One should supplicate Allah for them and ask Allah to forgive them.
*One should smile at them whenever he meets them.
*One should kiss their heads.
*One should work to pay off their debts. Abdullah b. Abbas () reported that Sa'd b. Ubaadah () sought the verdict of the Messenger of Allah (). He asked the Prophet ():
‘O Messenger of Allah () my mother passed away and she made a vow (but was not able to fulfill it).’ The Messenger of Allah () said: 'Fulfill it for her.'(Bukhari)
*One should be kind to their parents' friends and companions. Ibn Dinar, may Allah have mercy on him, narrated that Ibn Umar () used to ride a donkey and wear a turban. As he was on his way, he met a Bedouin, and he asked him: 'Aren't you so and so?' The man said: 'yes!' He said: 'Take this donkey, and ride it. Take this turban and wear it.' The companions of Ibn Umar () said to him: 'May Allah forgive you! You gave this Bedouin your donkey and turban?’ He said: 'I heard the Messenger of Allah () say:
'One of the greatest forms of kindness and obedience to one's parents is to be kind to the companions (and friends) of his father after he passes away.' His father (i.e. the Bedouin's father) was a friend of Umar's.