Except as set forth in this rule, evidence of statements made by a ward to a guardian ad litem is not, in any civil or criminal proceeding, admissible against the ward who made the statement. Such a statement is admissible in any proceeding wherein any other statement made by the ward to the guardian ad litem has been introduced and the statement ought in fairness to be considered contemporaneously with it. This rule does not require exclusion of any evidence otherwise obtainable from independent sources merely because it was presented to the guardian ad litem by the ward.
Vt. R. Evid. 412