I have a cousin who is almost 27 years old and is not circumcised till now because he is retarded and cannot distinguish between things. Will I be committing a sin if I leave him without circumcision?
All praise be to Allah Alone and peace and blessings be upon His Messenger, his family and Companions.
If the person mentioned is insane as you said and as it was said by the Chairman of Committee for the Propagation of Virtue and the Prevention of Vice (CPVPV) circumcising him may lead to calamity between him and his cousin, there will be no blame upon his cousin to leave him uncircumcised. He is not a sinner in any case.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.