The father of two children snatched by their alcoholic mother is appealing for the public's help to trace them amid fears she may have fled Britain for Ireland.
Tamara Dyson (37) snatched the four-year-old twins, Vixen Rae and Billy Blu Francis, from a social services contact centre in Skegness, Lincolnshire, on Thursday afternoon and they have not been seen since.
The children were "at serious risk of harm", a judge sitting at Lincoln County Court said, adding that they may have been brought here.
Judge Heather Swindells said: "Both Vixen and Billy were in foster care because of concerns about Tamara Dyson's ability to look after them, particularly as she has a chronic and dangerous alcohol problem.
"This is the second time in a week Tamara Dyson has removed the children from contact. It's the view of the court that the children are at serious risk of harm."
Because of concerns about the children, the judge took the unusual step of issuing an order allowing the care proceedings in the case to be reported.
The twins' father Billy Francis (31), an electrician from London, pleaded for the public's help to find the youngsters.
He said: "I last saw them on the morning of May 20 and I was shocked to be told later that afternoon that they had been taken by their mother.
"This was the second time that she had done this. On Monday she had taken them without consent. I am livid that this has happened with social services while under their care and responsibility."
Mr Francis said he met Ms Dyson 10 years ago and in 2006 they had the twins. They split two years later and Mr Francis blames her addiction to alcohol for the break-up.
He said that when the children went missing for the first time last week, he traced Ms Dyson to the home of a 90-year-old retired schoolteacher in the resort.
Mr Francis added that social services told him Ms Dyson managed to take the children while they were distracted making a cup of coffee.
He said: "Tamara is just not stable at the moment. She is drinking heavily and I am worried to death. She's a very distinctive woman and she has two kids with blue eyes and blonde hair with her. The kids are my life. I love them to death. I just haven't got a clue where they have gone."