Not true, for the most part. However, if she becomes a significant parent figure in your son's life and she and your son's father separate, she may have the ability to gain some form of custody. But, it is certainly expected that your son's father would involve her in HIS decision making, and then you and he decide together on what is in your son's best interest.
Answered on Aug 11th, 2012 at 8:45 AM