Answer:
(Fatwa: 1160/1003=L/1429)
If your cousin, while giving you the money, did neither specify it as debt nor there is any indication of the same, then it will be considered as gift and you do not have to return it back.
Allah (Subhana Wa Ta’ala) knows Best
Darul Ifta,
Darul Uloom Deoband
