It is far more common than it once was for couples in Illinois to choose to have children without marrying first. There can be personal, professional or even financial benefits to choosing not to marry the mother of your child. However, if the relationship fails, not being married can also cause some potentially serious issues for your family.
For example, your ex could attempt to claim that you do not have a biological link to the children or may simply start denying you access to or time with your children. If your ex won't work with you, you will need to take steps to establish yourself legally as the father of your children.