I hope I am not too late to answer your Q. I only saw it just now.
Chances are the mother already returned for them if the area where the nest is located has remained quiet with no human traffic. Since the bubs do not have fur, an easy way to check to see if mom did indeed return is to check the milk bands. These are literally bands stretched across the tummy underneath the skin. A milk band will appear white and swollen when the bub has nursed. You should be able to see without disturbing the nest. If the bubs do not have full milk bands and are making noises, then unfortunately they have likely been abandoned. Your options are to hand feed them or locate a wildlife rehab center.
KMR (Kitten Milk Replacement formula) is recommended to feed orphan mouse bubs via a non-needle syringe. A mouse bub typically opens his eyes at about 2 weeks old. It is also the age when he usually starts to go potty on his own. Since their eyes are still closed, they will need help going potty or they can bloat and die. This can be done by moistening a q-tip in warm water to gently go in a circular movement on the lower tummy/genital area. You can also gently wipe the area with a cloth moistened in warm water or dribble warm water over the area. Two weeks old is also the time weaning begins. You can introduce wild birdseed into the diet at that time. Bubs are usually completely weaned at 4 weeks old, but wild mice may take a week longer. TFM is an excellent mouse site that has complete information on hand raising orphans to include how much KMR and how often. They have photos of a mouse bub from day 1 to day 28, too, that will help determine their age for the feeding schedule. The links are below:
http://www.thefunmouse.com/info/orphanedmice.cfm#handraising
http://www.thefunmouse.com/info/daybydaybabies.cfm
TFM also has details on wild mouse care. It explains how to determine if they are abandoned, how to safely house them, what to put in the nest and what to feed while weaning. You cannot use a water bottle if you plan to release them in the future. The reason is because it is very important to keep a wild mouse as wild as possible whilst under a human's care. This means the bare minimum of human contact, scattering the food throughout the floor to simulate hunting and no water bottle. (For bubs, use a very shallow top of some type such as a Snapple lid. A bowl is not good as they can drown in it.) The link on wild mouse care follows:
http://forum.thefunmouse.com/viewtopic.php?f=2&t=12871
(If you cannot read the above thread, you will need to register first.)
TFM also has an active forum. You can search the archives for more information or post your own Qs. The link is below:
http://forum.thefunmouse.com/index.php
When you are ready to release them, pick an area with a lot of ground covering, bird activity and no buildings. The ground covering assures a nest. The bird activity assures a food source is near such as berries and nuts. The lack of buildings assures they will not enter a structure with kill traps. A park would be ideal. Also, since mice are crepuscular meaning primarily active at twilight hours (dawn and dusk), release them at one of these times. Be sure there are no storms in the forecast, too.
Raising rodent bubs is difficult. If you decide to ask a rehab center to take over, the following links should help in locating one nearby:
http://www.wildliferehabber.org/st_disp_list.php
http://www.rainbowwildlife.com/find-rehabilitator.htm
http://www.wildlifeinternational.org/EN/public/emergency/emergencyrehab.html
http://forum.thefunmouse.com/viewtopic.php?f=9&t=12871
Your mom has clearly passed on to you a lot of wonderful qualities. What a lovely family! I sincerely hope all of bubs survive.