The family of a parent and son who went missing in Spain say they fear they are lying “at the bottom of the sea”.
Liam Poole and his son Daniel travelled to Malaga on 31 March but have not spoken to relatives since 1 April.
Their hire car had not been returned and their luggage and passports were found in their hotel room, police said.
Sussex Police said the pair, from Burgess Hill in West Sussex, had travelled to play golf and look at holiday homes
But Daniel’s grandmother said: “Daniel didn’t play golf but he and his father keep coming back here.”
Kathy Catney said she suspected the pair were “up to no good” and had visited Spain several times in a year.
“I do believe Liam’s died, I think he’s been killed, ” she said.
“I hope he’s not at the bottom of the sea.”
Ms Catney has been to the resort in Spain to try and track down her grandson and said she was surprised there were no missing posters in the area.
One barman claimed he had seen Liam, who has a string of narcotic related sentences, and Daniel but said they were both “wrong-uns”.
Ms Catney said: “I knew he[ Liam] had done time for drugs because he was with my daughter that time, we always suspected he was up to no good but again we just didn’t ask questions.
“I knew he was going to Spain to meet up with somebody to do some sort of deal. Whether that was property[ or] narcotics I actually didn’t know.”
PS1 00 k raised ‘in hours’
Ms Catney said Spanish police had told the family “two or three weeks ago” the hire vehicle had been is available in a street near Estepona
She said the family received a phone demand for PS1 00,000 the day after the pair disappeared and they managed to raise the money “in three hours”, but nothing further materialised.
Sussex Police said it was supporting the family and assisting the Spanish police.
Spanish police said the investigation remained open, and they would not be commenting further.
More on this story can be seen on Inside Out on BBC One in the South East on Monday at 19:30 BST or afterwards on the iPlayer.