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Your sister may be entitled to spousal support if she was in a common law marriage. That is, if she and her boyfriend presented themselves as being married and they were free to get married. That is, if they were not married to other people when they were together. If so, she would need to file for divorce and then request for spousal support. Click on the link below for divorce forms and instructions:
The children are entitled to child support. She can apply for child support services with Colorado child support enforcement so that the department can assist her in completing all necessary forms. Click on the link below for application information: