Karen went through Ned's clothes preparing to do the laundry when she found the neck chain, she was shocked, the same neck chain her mother gave to her telling her it was her father's, her dad had made a special neck chain for his children with his name inscribed on it, she never got to meet him cause she was born out of wedlock, he had another wife, mom told her never to lose her's, she searched again and saw a picture of little Ned with his parents the man had the same neck chain, she ran to her bag, brought out her own neck chain, comparing it they had the same name.
She went numb, she was married to Ned, with their child Abigail, that was their father in the picture,Ned was her brother.
She needed to tell Ned, went to his room, "Sweedy I have something to say", "alright my angel", Ned looked at her so sweetly and adorably, she was going to destroy the moment but she had to, she looked into his eyes and said "Abigail is going to have a brother" she was pregnant..... But she bottled the part of him being her brother.
Picture [source] :( http://en.mihaaru.com/two-thousand-isles-message-in-an-atoll/).