When it comes to gifting things that are haraam we need to look back to the general rule where Prophet Muhammad صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ said there is no obedience to creation when that means disobedience to Allah. It doesn't matter if its your money or that of your parents.
To purchase something that is forbidden, to transfer and deliver it is not permissible. To make up for this make sure you Honour and overcompensate with your parents. Always try your best, show mercy and keep the communication open.
Shaykh Omar Suleiman answers and explains...
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