"We hold comfort in thinking Rebecca held out her arms for her sister again last Tuesday," said Doug Belliston, the girls' grandfather.
Hundreds wearing yellow and pink ribbons, symbolizing the girls' favorite colors, gathered Saturday to mourn the loss of Rebecca and Rachel, who died from apparent exposure to pesticide.
Rebecca, 4, died on Feb. 6, and 15-month-old Rachel followed three days later on Tuesday.
Rebecca loved the color yellow and strived to be like her older siblings, Belliston said. The girl recently had taught herself to write her name, he said.
Rachel loved ducks and would reach out to Belliston for hugs and kisses whenever she visited her grandparents.
"I can think of no greater trial than what this family is going through," said Michael Thompson, president of the West Layton Stake of The Church of Jesus Christ of Latter-day Saints. "But I can think of no family with greater faith."