A 23-month-old boy pulled unconscious from a northwest Sydney backyard pool remains in a critical condition while his twin sister died on Boxing Day.
The death of the little girl marks a tragic end to Christmas for the twins' family who have been at their bedside since they were discovered in the Kellyville Ridge pool around 7pm last Tuesday.
NSW police say the little girl died in hospital on Monday, while her brother is still in a critical condition and undergoing treatment.
The toddlers were rushed to the Children's Hospital at Westmead under police escort on December 20 where they were put on life support.
News of the tragic event had spread through the community, with a Rouse Hill Catholic church holding a special prayer service and urging parishioners to keep the twins in their hearts.
"At this blessed time of the Christmas season can we please pray ... to our Lord to bless these toddlers and give them the strength they need to recover," a family friend, who was hoping for a "Christmas miracle", posted on her personal page on December 22.
Police have said the family's pool fence seemed to be adequate and reminded parents to remain vigilant.
