The two, along with Guadalupe and Matthew Bonds, were killed earlier this month at a home on Church and Curtis.
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Hundreds of people filled the Reedley Cemetery on Monday morning.
Loved ones traveled hundreds of miles to be here in support of the Bonds family as Billy and his son Darrell were laid to rest.
They were found dead in the backyard of their Reedley home earlier this month, along with Guadalupe Bonds.
The body of her husband, Matthew, was discovered days later in a detached garage at their next door neighbor's home.
"I'm at a loss for words because I'll never get to see them again," said Martha Jean McDonald Taylor, Darryl's cousin.
"To have four leave at the same time it's awful if you're shaking all morning just knowing that I'll never see them again."
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Martha McDonald is Darrell's cousin, and Billy's niece.
RELATED: Family members say goodbye to Reedley murders victims Matthew & Guadalupe Bonds
She remembers her family as tight knit and says she spent a lot of time with Darrell growing up.
"He loved us. He had a soul he used to read the Bible to me. I'm just happy they're all home with the Lord right now but I just hope whoever does this gets caught," said McDonald Taylor.
The Bonds' 17 year old neighbor is in custody and has been charged with the four murders.
His mother and her boyfriend were also arrested, for accessory after the fact.
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Investigators believe money and other items stolen from a safe motivated the violent crime.
But the victims' relatives say they are still left with many unanswered questions and four missing pieces to their family.
"Why can someone take the lives of four people who did nothing wrong? My uncle would help anybody," McDonald Taylor added.
The Bonds family says it is holding on to hope that soon justice will be served.
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