OPINION OF THE COURT
This case began in due process hearings filed under the Individuals with Disabilities Education Act, 20 U.S.C. § 1400, by Appellees herein. The hearing officer found that the School District had denied the Appellees an appropriate education for the first three days of the 1998-1999 school year, and ordered the School District to provide the Appellees with three days’ compensatory education. The State Review Panel affirmed this decision. The School District filed a complaint in the nature of an appeal from the decision of the State Review Panel. The Students counterclaimed for attorneys’ fees.
The District Court granted summary judgment to Appellees on March 6, 2000, but ordered the Clerk to withhold entry of judgment pending a resolution of the questions of remedy and attorneys’ fees. The Students filed a motion for attorneys’ fees and costs, and for a compensatory education remedy. The District Court granted the Students’ motion in the amount of $20,270.32.
The School District filed its appeal from the District Court orders at Docket No. 00-2601, and Docket No. 00-2689. The Appellant School District also filed a protective notice of appeal at Docket No. GO-2912.1 The School District’s appeals have been consolidated. Because we are unable to determine whether this case was five throughout the federal proceeding below and on appeal, we remand to the district court.
*395The Appellant School District raises several issues, none of which we reach. We are severely hindered in our review by the fact that the only brief filed on appeal is that of Appellant. Appellee’s attorney has formally withdrawn from the case, and on information received from the Clerk’s Office, the Appellees have moved from the area and have expressed no interest in the appeal. Consequently, the only argument that is before us is that presented by the Appellants therein.2
The Federal Rules of Appellate Procedure do not allow us to enter default judgment against an appellee for failure to file a brief. However, this does not relieve us from the Constitutional requirement to ascertain that a case continues to be live throughout the appellate process. Article III, § 2 of the Constitution requires there to be a live case or controversy throughout the pendency of an appeal. See e.g., United States v. Kissinger 309 F.3d 179, 180 (3d. Cir.2002). This is not a case where the appellee stands by and allows us to proceed on only the appellant’s briefs and the opinion of the district court. See United States v. Everett, 700 F.2d 900, 902 (3d Cir.1983) (“If an appellee after proper notice fails to file a brief, then we may decide the case on the brief of the appellant only.”). This case goes further.
Before the District Court, the Appellant School District argued that there was some question as to whether the client was still interested in the litigation, or whether the attorney was continuing the litigation to recoup fees. At the hearing below, the Appellants pointed to evidence questioning the client’s continuing interest in the case. See Appendix at 471-478. Specifically, the Special Education Review panel reached its decision on May 28, 1999. There is no question that the client was involved in the litigation through this point. The School District filed its complaint in federal court on June'24, 1999. See Appendix at 83. A review of the billing records submitted to substantiate the fees raises questions as to the client’s involvement after this point, especially in fight of the facts as they now stand.
Appellants claim that Kendra S. has not lived at her Harrisburg address since May 1999. See App. Brief at 22 n. 5. This is substantiated by testimony at the hearing. See Appendix at 473. Despite this change in address, the invoices for legal services listed Kendra’s Harrisburg address through May, 2000. See Appendix at 349. After that, no address is fisted for Kendra S. on the invoices. See Appendix at 347. The last conversation with the client is indicated on the invoices as a May 12, 1999 telephone conference. See Appendix at 356. The invoices do reference “letter/fax to client” on June 14, 2000, Appendix at 347; and April 18, 2000, Appendix at 350; however, Kendra S.’s address is not fisted for one invoice, and is apparently wrongly fisted on the other. This is in contrast to the regular consultation with the client indicated in the earlier invoices. See e.g., Appendix at 355-362. If the client no longer maintained an interest in the case throughout the federal hearings, the case was no longer five.
While normally, the invoices and address change might not be enough to bring into question whether or not the case is moot, the unique facts of this case leave us in an unavailing position. The Magistrate Judge noted the Appellant’s concern, but made no ruling on the record beyond noting at the hearing:
it seems to me that where counsel has represented the clients in the adminis*396trative proceeding, and has prevailed in the administrative proceeding, and then ... enters an appearance on behalf of the same party [on appeal], that there is no basis in that for an inference and no basis for placing a burden on counsel of proving that counsel has the authority to represent that same party.... I think under those circumstances counsel’s authority to represent the client is not subject to question.
Appendix at 478.
The attorney below has withdrawn from the case, and the Clerk’s Office has indicated that Kendra S. is no longer interested in the outcome of this litigation. If this is true, then the case is moot. “It is boilerplate law that it is the party who is entitled to an allowance for the legal services of his attorney.” Mayberry v. Walters, 862 F.2d 1040, 1042 (3d Cir.1988). We are not in a position to make a factual determination as to Kendra S.’s continuing interest in this litigation. We also cannot dismiss the case at the appellate level for failure of the Appellee to file a brief. Furthermore, we are not inclined to address the merits of this appeal when there are outstanding questions as to whether the case is still live. Therefore, we remand the case to the district court on the issue of mootness. If the Appellees, now acting pro se or with new counsel, do not participate, the District Court is empowered to vacate its earlier judgments and dismiss the action. See Salovaara v. Jackson National Life Ins. Co., 246 F.3d 289, 296 (3d Cir.2001) (“Vacatur may be decreed for judgments whose review has become moot due to circumstances beyond the control of any of the parties or where mootness results from the unilateral action of the party who prevailed in the lower court.”).