Twin brothers who sneaked out of their 18th birthday party to steal from their step-grandmother (74) were sentenced to nine years each for her manslaughter.
Robert and James Maskell, who were cleared of Anjelica Hallwood's murder, were also found guilty of robbery.
Their accomplice in the killing, Dwane Johnston (19), who had been going out with Hallwood's granddaughter, was also sentenced to nine years.
During their trial at London's Old Bailey last month, the jury heard how the Maskells believed Hallwood had thousands of pounds in savings and wanted the cash to spend on mobile phones.
As they ransacked her house, Johnston, who had just been released from prison and had been staying with Mrs Hallwood, confronted the pensioner before beating and strangling her on January 28th, 2004.
Her injuries included several broken ribs, a smashed eye socket and a fractured cheekbone.
Although Mrs Hallwood was the twins' step-grandmother she had known the pair since they were born and they called her "gran".
The jury heard how the twins had been celebrating their birthday at their Edmonton, north London home but left before midnight to meet up with Johnston.
After the killing, the three teenagers bought kebabs and returned to the party. They were later caught on CCTV joking and laughing as they tried to spend the stolen money, although much of the £1,000 was in outdated currency.
"It is difficult to imagine a more despicable crime," Judge Gerald Gordon told the trio. "For reasons of pure greed and regardless of any effect upon her you sought to rob her."
Mrs Hallwood's son shouted "Bye scumbags" as the three were led away to the cells.
