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Published 09:27 2 Jun 2016 BST
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Image courtesy of BBC News
While the process has been emotionally draining and has bankrupted them, they are relieved to be travelling home with their baby boy.
Mercedes revealed: "The thought that the baby I had been nursing, taken care of, loving him, bathing him, that he was not mine and then I had another thought which came with it -where's my baby?
“So I had two thoughts -- what's going to happen with this baby and where's my baby… I think we were in love with the baby.
“Even when I did the DNA tests, I thought I was betraying him. That was the feeling I had - I'm betraying my son but I cannot live with this."