D.C. Code § 21-115
A guardian appointed by the court, other than a corporation authorized to act as guardian, and a testamentary guardian, unless otherwise directed by the will making the appointment, before entering upon or taking possession of or interfering with the estate of the infant, shall execute a bond in such penalty and with such surety as the court approves, to be recorded and to be liable to be sued upon for the use of a person interested, with the condition that if he, as guardian, faithfully accounts to the court, as required by law, for the management of the property and estate of the infant under his care, and delivers up the property agreeably to the order of the court or the directions of law, and in all respects performs the duty of guardian according to law, then the obligation shall cease; it shall otherwise remain in full force.
D.C. Code § 21-115
Undertaking in lieu of fiduciary bond, see § 16-601. .