Our expert says:
If the question is about your brother's child, I doubt that you would have any right to have any such test done. If HE is being considered as the child's father, HE could presumably have requested that DNA testing be done, on him and the child, but he'd need legal advice on that if the mother is unwilling to enable this to happen. Now, if he is dead ( your message wasn't clear about that ) then it would be up to his Executor, and possibly ( again, here, legal advice would be needed ) another beneficiary / family member who felt the child should not qualify to be a beneficiary, to ask for this to be done.
If he left a will, his belongings / estate would be divided according to what he said in the will, whether or not any of the beneficiaries he named were related or not. If he left no will, then there are legal propcedures for someone who dies "intestate" which considers children and other relatives to be the beneficiaries, and there should I'd guess be some procedure to challenge a dubious claimant.
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