He loves his deceased father and wants to do something good for him

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Check below answers in case you are looking for other related questions:
He was not able to pray before he died; can prayers be offered on his behalf?
She stopped praying when she was sick, then she died; do her heirs have to do anything?

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Related Answers:
What can benefit the deceased after his death? Can he hear what the living say?
He is complaining that his mother mistreats him
His mother makes false accusations against his wife
He was not able to pray before he died; can prayers be offered on his behalf?
She stopped praying when she was sick, then she died; do her heirs have to do anything?

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