Help please!

im trying to find this manga, but I forgot the name. the MC was reincarnated and was raised by 3 heroes. expect the heroes were undead. the grandpa was a ghost, the dad was a skeleton, and I forget what the mom was, but she used to be a priest so she would pray to her god for bread for the MC and would be set on fire because of it. The MC gets burns on his hands from trying to save her from the fire (when he didn't know what is was). Does anyone have the name?