Sebastian Cizman, 12, was found unresponsive on Friday at his family's home in Glasshoughton, West Yorkshire, during his younger brother's First Holy Communion celebrations.
Sebastian, 12, was at home celebrating his brother's First Holy Communion at an address on Manor Grove in Castleford, West Yorkshire, before being found unresponsive.
The heir to the Monegasque throne and his twin sister, both 10, marked the religious ceremony with a series of sweet family portraits shared to Instagram.