A post mortem performed on the two siblings, who drowned while taking a bath in a drainage canal near their Parika Backdam home on Saturday revealed that they died from asphyxiation.
The bodies of Malissa, 8, and Miron Torres, 6, were fished out of the canal by residents after an alarm was raised by their mother, Elizabeth Francis, when she discovered they were missing.
Their bodies were taken away by a hearse from a funeral parlour on Saturday night and taken to the West Demerara Regional Hospital.
The children will be laid to rest today after residents pooled their money and arranged a funeral service for the siblings, whom they had grown accustomed to in their neighbourhood.
Their grieving mother told the Guyana Chronicle that the children left home undetected while she was inside the house tending to her three-month-old baby girl, who has a cold.

The children were missed at about 18:30hrs and their bodies were found at about 19:30hrs.
According to the mother, Malissa was a good swimmer and her brother was not.
She believes that her son got into trouble while swimming, his sister tried to assist him and they both drowned.