It depends. There is a presumption under Michigan law that when someone IS married, that any children born during that marriage are the biological children of both spouses. This can be challenged, if there is strong evidence to overturn it.
When there is no marriage involved and paternity is not challenged, then there are presumptive rights, as well. If a father is named on the birth certificate, the child will be considered an heir for Michigan law purposes. That is NOT the same thing as having "rights of inheritance."
There really is no such thing as "rights of inheritance," under Michigan law. Having said that, it is not possible to disinherit a spouse, under a Will. It IS possible to disinherit a spouse, through other means. It is possible to disinherit a child, and it is easy to do so. A child has no inherent right or entitlement to the assets of his or her parents.
All that being an heir gets you is the right to inherit, IF your parents do not leave their assets to someone else. So if there are probate assets, (assets titled in the name of the deceased ALONE, with no joint owners or beneficiaries), and if there is not a Will providing otherwise, then Michigan law provides for the child to receive a portion of the estate. That means, there are a lot of IFS, before you can say that someone is entitled to inherit anything from a parent or otherwise. Being born out of wedlock does not diminish those rights, however.
Answered on Aug 22nd, 2012 at 6:43 PM