It's called a parasitic twin I believe (or triplets in this case) and there are various "types". In fact many conjoined twins end up as one viable child and the other parasitic. It think this is really just a variation of this. Freaky to be sure though.
Another thing coming to light right now after some custody battles are what the medical community are calling "chimeras". People with more than one set of DNA. For example a person hair may have DNA of one type while internal organs are another DNA sequence. There was one particular case in the states where a mother of two was charged with welfare fraud and had her kids taken away because it had been determined genetically that she was not the mother. Came as news to her of course. Long story short she was 8 months pregnant with a third child during the trial and the judge told them to test that baby. Sure enough when the kid was born it wasn't hers either so said the DNA. After extensive testing with a specialist who had run into this before they found that she indeed had different DNA in different tissues. She was unusual in that there was no outward indication of this...many chimeras will have checkerboard skin (black and lighter for example).
It is something that in some few select cases could really throw a wrench into the legal system.
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