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You should be able to establish paternity by testing someone in the fathers immediate family, such as a brother, sister, mother, father, etc...the family of the father still carry his DNA even after he is dead.
No, as she need not even know, unless it applies to child support. With a 30% paternity fraud rate, men should always check paternity. see link
It is possible to legally establish paternity even if the father's name is not on the birth certificate.
No, as the other child, even if a fraternal twin, can have a different father.
If he is the real father, yes. Demand a paternity test even if you don't suspect cheating, 10% of children are fathered by men who think they're the real fathers but are not. You don't have to sign before the test but if you do, you'll be the legal guardian even if it isn't yours.
Yes, but if he's not the father, it paternity fraud.
Yes, if he's an identical twin
Issues of child custody are not settled by names on birth certificates. Generally, the court will try to determine what is in the best interest of the child. Who is a better parent, the father or the mother? Who will take better care of the child? That is the issue.
With a tissue or hair follicle, with the permission of his family, however it is far more expensive than a standard paternity test.
maybe
Not necessary, even test can be performed on discreet samples. To establish relationship only father's and child sample required.
Yes, to stop him from going for custody, even in states where he' not allowed to to stop her collecting child support on a child that's not his.