A family has been evicted from a home that a pensioner with terminal stomach cancer claims his granddaughter sold without his consent.

Bruce Buckley, 77, claims granddaughter Sheree sold the 11-acre New South Wales Central Coast property to her boyfriend Shayne without his knowledge.

Police are now investigating allegations Bruce's signature was forged multiple times when Shayne bought the property for well under market value.

Bruce Buckley claims he was forced out of his own home by his granddaughter. (A Current Affair)

Now, the bank claims Shayne has not been paying the mortgage, and has ordered the family out.

Sheree has also handed herself in to police after not turning up to court to be sentenced on unrelated shoplifting charges.

Bruce is now living with his son-in-law Don Barnes.

Mr Buckley claims granddaughter Sheree (left) sold his 11-acre property to her boyfriend Shayne (right) without his knowledge. (A Current Affair)

"That's justice starting to come in, that's what I think," Don said.

He said he was disgusted to find out Shayne and Sheree were still trying to sell the home on Gumtree, despite their pending eviction.

The couple are also trying to sell the property's dog kennels, dishwasher - even Bruce's prized panel van, which Don said was advertised for just $80.

Sheree and Shayne's family have been ordered out of the home. (A Current Affair)

"It's Bruce's car, it's registered to Bruce, but they're still trying to get cash wherever they can get cash," Don said.

"And that just shows how desperate these people are for money."

Bruce now says the issue is not just about money, but also principle and pride.

Mr Buckley's son-in-law Don Barnes claims Sheree and Shayne tried to sell Mr Buckley's panel van online. (A Current Affair)

"I'm battling," he said.

"I'm not real good, but I'm still here, that's the thing, and I'll fight it to the end, I hope."