The petitioners, former foster parents of a minor child, appeal from a judgment of a single justice of this court denying their petition pursuant to G. L. c. 211, § 3. We affirm.

The child is the subject of a care and protection proceeding in the Juvenile Court. The proceeding was consolidated with a guardianship proceeding commenced by the children’s maternal aunt and uncle. During the trial of the matter, the petitioners moved to intervene. Their motion was denied. Following trial, guardianship was granted to the aunt and uncle. Thereafter, the petitioners filed their own guardianship petition, which was dismissed as moot. In the county court, the petitioners sought relief from the order denying their request to intervene. Final judgment has not yet entered in the Juvenile Court proceeding.

The case is now before us pursuant to S.J.C. Rule 2:21, as amended, 434 Mass. 1301 (2001). Under the rule, the petitioners bear the burden of demonstrating the lack of an adequate alternative remedy. They have not done so. Concerning their motion to intervene, through which they sought intervention as of *1020right as well as permissively, they could have appealed from the order denying the motion. See Care & Protection of Zelda, 26 Mass. App. Ct. 869, 869-874 (1989) (foster parent and her sister appealed interlocutorily from order denying motion to intervene, where they sought intervention as of right). See also Attorney Gen. v. Brockton Agric. Soc’y, 390 Mass. 431, 432-433 (1983) (under Mass. R. Civ. P. 24[a], 365 Mass. 769 [1974], denial of claim of intervention as of right immediately appealable). It is not too late for the petitioners to seek leave to file a late notice of appeal because less than one year has passed since the denial of their motion. See Mass. R. A. P. 14(b), as amended, 378 Mass. 939 (1979). As for the dismissal of the petitioners’ guardianship petition, they have filed a timely notice of appeal. Any concern the petitioners might have about the speed with which the Appeals Court might handle their appeals from the denial of their motion to intervene and from the dismissal of their guardianship petition can be addressed by motions for expedited rulings on those appeals. Cf. Restucci v. Commonwealth, 442 Mass. 1045, 1046 (2004).1

Judgment affirmed.