Five-year-old Caitlin faith and her three-year-old brother Aiden thomas died on 5 November 2006 at their house in Bodelwyddan, near Rhyl.
The children's father Perry Samuel,(monster) 35, has been charged with their murder.
Family, friends and villagers attended the service at St Margaret's Church, Bodelwyddan, for the children described by their family & friends as "little angels".
They were taken to Glan Clwyd Hospital where they were pronounced dead.
The children's mother Sarah Graham was out at a Bonfire Night concert when the tragedy took place.
caitlin faith and aiden thomas was burried at st margrets church,
Two tiny coffins, one pink and one blue, were carried into the church, followed by mother sarah graham and the children's grandmother Jan Daggett , and other members of the family and friends.
The funeral procession entered the church to Celine Dion's song Fly.
Leading the service, Mr Hughes said: "No words can really express our sympathies.
"We all know these are two little individuals, each with their own special identities.
"They've come from God, stayed with us for a brief time, and returned to God."
He continued: "We feel their loss acutely. We believe that these little ones are still close to us.
"They will always be part of our lives. As families, and as a community, we are in God's house to commend into his loving arms these two little children."
The congregation sang All Things Bright and Beautiful before Mr Hughes read out some thoughts from Caitlin and Aiden's family and poems written by kelly foulkes and there auntie becky x
The vicar said Caitlin and Aiden's family did not want to remember the youngsters as "two tragic children snatched away", but for their vibrant personalities.
Caitlin was described as Princess Caitlin - a "proper little madam, with the biggest blue eyes in Wales".
The congregation heard how she loved dressing up in pink and dancing to her favourite pop songs.
The family remembered Aiden as "a proper little man, with a booming deep voice, older than his years and a passion for driving faster than the wind on his bike".
He loved his mum's cuddles and wanted to own a fast car like his uncle Mikey, when he grew up, Mr Hughes told the church.
He added: "Caitlin and Aiden loved their mum Sarah.
"The long hot summer saw days filled with fun, laughter and games.
"It was their last, but the best summer ever, filled with priceless memories."
The coffins were carried out of the church to the music of the All Angels song Songbird and taken to the cemetery behind for a private burial.
two beautiful angels who will be missed so much xxxxx
