You cannot be appointed as legal guardian until you are at least 21 years of age. Given the minimal difference in age from your nieces, it is possible that a judge will have some questions about your ability to function as a parent for a couple of teenagers. But, that is a question to be decided on all the facts and circumstances. If they have are now in foster care, that suggests that there is a Dependency & Neglect case ongoing in the Juvenile Court. That means that the State of Colorado is actively involved and probably has legal custody over them and for you to acquire any responsibility or authority the court will have to decide if they should be removed from foster care and placed in your custody. You will have to pursue any desire to take responsibility through that court case.
Answered on Aug 02nd, 2011 at 7:12 AM