Your babies are absolutely adorable! And I know exactly how taking in stray cats and making bad decisions are, believe me. I finally paid my credit card off, and guess what? More kittens! Ferals are fun to watch. I've seen a lot of feral kittens caught and tamed... And then the goal to catch Momma, oh boy! Your best bet is to get a humane trap from the humane society and catch each feral in your pack. First, find a TNR program in your area.. Which is for ferals, it means Trap Neuter Return. It should be free or very cheap.
Money raising ideas could be making gift baskets with home-made chocolates and maybe a card and some flowers... And try to sell them in front of a local store (with permission, of course). I see stuff like that at my college all the time. Mostly brownies though *yum*
Anyother idea is crocheting and knitting! I absolutely love that stuff.