If you have a crockpot (either you or your mom, or check your local thrift store), Throw a pound of stew meat, 16 oz baby carrots, 2 or 3 potatoes chopped, and a can of diced tomatoes in the crockpot & let it go for 6-8 hours on low. You can throw in a bay leaf, or sub other meat (like sausage or kielbasa).
Whole wheat noodles (spaghtetti, or whatever), plus 1 jar of the pasta sauce that has lots of veg in it, plus some frozen meatballs from the freezer section of the grocery (simmer meatballs in the pasta sauce while the noodles are cooking).
The meatballs are also good for sandwiches--use same sauce and then toast some buns or bread, add a piece of mozzarella or provolone, and then add the meatballs (2 or 3 per bun). Serve w/ salad.
1 jar salsa, sour cream, cooked chicken (you can use the extra from the rotisserie, or buy precooked cubes or strips of unbreaded chicken), a can of fat free refried beans or black beans (drained), and some whole wheat tortillas.
Regarding your toddler, it might be worth it to buy a 2nd hand highchair or booster seat that has a seat belt. Bring some playdough/crayons/markers/fingerpaints and paper and strap the baby into the chair/booster for 10-15 minutes. That way the baby is contained while you're trying to cook.
Kraft has some good recipes that use instant rice and canned goods that take maybe 20 minutes in the skillet/on the stovetop. I buy the instant brown rice; its more expensive, but better for you. Go to www.kraft.com to find some you like.
Even if you don't have a lot of time to do meal prep, it's worth it to get a crockpot. You can throw a whole bag of frozen boneless skinless chicken breasts into it, with a bit of water or broth, and cook it up & divide it into meal size servings, and then make whatever you need to -- it really speeds up cook time on a daily basis. Precook ground chuck by breaking it up in a pot & covering it completely with water and bringing to a simmer/low boil until no longer pink. If you have a big pot, you can cook 5# at a time, and then separate out into meal-size amounts for spaghetti, tacos, hamburger pie, poor mans stroganoff (sp?), etc.