What is the obligation of a son if he learns that his father was not just among his sons in his gifts?
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Question:
If the father gives to some of his sons, and this son who was given does not know that this matter is not permissible, what is his obligation now?
Answer:
He is required to return it. Is his father alive or dead? If his father is alive, he returns these things to his father. If he is dead and he wants to be scrupulous and return this to the heirs, that is better for him and purer for his conscience. Leave what causes doubt for what does not cause doubt. Yes.
If the father gives to some of his sons, and this son who was given does not know that this matter is not permissible, what is his obligation now?
Answer:
He is required to return it. Is his father alive or dead? If his father is alive, he returns these things to his father. If he is dead and he wants to be scrupulous and return this to the heirs, that is better for him and purer for his conscience. Leave what causes doubt for what does not cause doubt. Yes.
Source
قناة «العلامة الدكتور صالح الفوزان»، ما الواجب على الابن إذا علم أن أباه لم يكن يعدل بين أبنائه في هبته؟ للشيخ صالح الفوزان — youtube.com
The Arabic text is a machine transcription of the audio recording.