Hundreds of people have attended the funeral of the two children who died in a collision last Sunday outside Tuam, Co Galway.
In his homily, Fr Martin Gleeson described two-year-old Kate Gilmore and her 12-week-old sister, Grace, as saints in heaven.
Archbishop of Tuam Dr Michael Neary was a concelebrant.
The girls' parents, John and Michelle Gilmore, were supported by their families.
Fr Gleeson said the events of last Sunday had left the community in deep sorrow.
He said "shattered" was the only word to describe the grief generated by the loss of two beautiful children.
Fr Gleeson said John and Michelle had been given a very heavy cross to bear.
Kate and Grace were later buried nearby in Killower Cemetery.