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Here are a couple of ideas...
1. Explain to them that for medical reasons with how far medical science has come in the last few years you now need to have accurate info to protect you. It is primarily the 1st and 2nd degree relatives that show your risk level of getting a hereditary disease and if you do not have the info the chance of a wrong diagnosis and delay in treatment can be life threatening.
2. Tell them that in order to put this to bed you are going to order a dna test for the three of you. If they agree then do it. If they don't agree then you could test with your 'sibling'. If it is a no-go then you could do it without their permission but that is a very slippery slope to go down and not sure if it would be worth it in the long run...
Kind regards,
Dickons
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