The father of troubled singer Amy Winehouse fears her jailed husband Blake Fielder-Civil is planning to divorce his daughter.

Mitch Winehouse has revealed that Fielder-Civil, who is currently being held on remand at London's Pentonville Prison on charges of perverting the course of justice, is sick of rowing with his famous spouse and has threatened to divorce her.

Fielder-Civil is said to be far from happy with Winehouse's decision to spend a festive holiday in the Caribbean with her ex-boyfriend George Roberts - while he was behind bars.

And now Winehouse has been spotted partying with music producer pal Mark Ronson, sparking rumors of an affair.

The singer's father has fuelled speculation that the pair's marriage is on the rocks - and, according to celebrity blogger Perez Hilton, he is blaming Fielder-Civil's mother for encouraging a split.

Mitch Winehouse tells British magazine Grazia, "Blake threatened to issue divorce proceedings when they were having a row. Unfortunately, Blake is influenced by things his mother has said.

"I think Georgette (Fielder-Civil's mother) wants them to divorce, but it's up to them.

"From Amy's point of view, she would stick by him not matter what. But he has said things like, 'I want a divorce'."

The couple wed in Miami, Florida last May (07). (c) WENN