Yala Mueang district chief Kongsakul Chantharat said the blast at the cemetery in Moo 4 village in Tambon Yupo killed Say Jehdoma at 6:30 am.
Say’s father, Asi, was severely injured.
The blast also hurled the body of Say’s mother out of the grave.
Kongsakul said the mother was buried on Thursday and the father and the son went to grave to read from a Koran and prayed for the mother.
Kongsakul said it was unprecedented that Muslim insurgents buried a bomb in a Muslim cemetery.