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An individual who acts in this capacity is generally called a guardian ad litem in such legal proceedings; in Scotland, curator ad litem is the equivalent term. This term is no longer used in England and Wales since the amendment of the Children Act 1989, which established the role of children's guardian instead.
Guardians Ad Litem can range from $200-$350 per hour. In some limited instances, you can find one to work on a pro bono basis. Check your county services or the clerk's office for a low fee or pro bono GAL. Also, your lawyer should be able to refer you to one.