All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad is His slave and Messenger.
Rain is like other signs of Allaah, like the sun and the moon, and since the sun and the moon do not eclipse for the death or life of a person, rain does not as well descend due to the death or life of any person. The descent of rain on the occasion of the death of someone is not a sign of a good end to his life. Likewise, we do not know that dying on ‘Eed Al-Adhha is of any excellence.
You should know that among being kind and dutiful to the parents, is to benefit them after their death by supplicating for them and the like, as they benefit from these acts of righteousness, like supplication, acts of charity and so forth. For more benefit on how to be kind and dutiful to the parents after their death, please refer to Fataawa 83233, 85086 and 84938.
Finally, it should be noted that celebrating the anniversary of the dead is an innovation as we clarified in Fatwa 87452.
Allaah Knows best.