The kittens will need to be cared for by you or your mom and yes, need to eat soon and also
kept warm. I haven't done it myself though. Found some details here:
http://www.messybeast.com/handrear.htm
The feeding details are about 1/3 the way down the page but they recommend for healthy kittens the following:
"If commercial kitten formula is not available, a suitable feed mixture for healthy kittens is 1.6 ml evaporated milk, 1.6 ml cooled boiled water, 1 level teaspoon glucose, 1 small egg yolk (no white at all). One recommended by a veterinarian is 3 oz condensed milk, 3 oz water, 3 oz plain full fat yoghurt, 3 large or 4 small egg yolks (no whites). An alternative is kitten glop. These are not suitable for sick kittens. "
I hope they are ok! Good luck to you and keep us posted!
For more links, try searching with keywords such as "hand rearing kittens".