Sounds tricky and I hope you manage to find a solution that satisfies all parties. All I would say to each of them (in a round table discussion) is that as Founder you are happy with all (including yourself) receiving an equal share as you consider each of them to have been a crucial part of the success. By implying that you could have asked for a greater share but didn't it may help to sooth the greedy $$$ signs that appear to be about to rip your as of yet to be launched company apart.

Good luck & chalk this issue as a Life Lesson. Money, Friends, Co-Founders. Pick two and never mix all three, especially without anything in writing. Friendships go sour all the time, especially when money is involved.

If all else fails, try to see if you can find a local mediation service which is both a lot cheaper than sitting in a law office as the clock and bill runs up and also often a skilled mediator may be able to word things in a way that all sides can see what a fair and equitable solution might be. Good luck.