You really should NOT let them go swimming until you get this pool straightened out. There have been a lot of good suggestions but you are not really following in them. I am trying to take you through them step by step but you need to post the test results in between so we know what is going on and what you need to do next to get this pool balanced and SAFE to swim in!
You have added the metal sequesterant. Now you need to get the water retested for metals to see if it worked. Did you follow the directions on the bottle in terms of what your chlorine and pH needed to be before you added it? If not it might not have worked. Have you looked for the Aquachem 6 way test kit that uses liquid reagents at Walmart or Kmart? You will need it or a better kit. The Aquachem is the best cheap kit you can get for under $20.
You are going to need to be testing this water and getting accurate results for more than just chlorine and pH before this pool will be swimmable!

Sorry if I am coming on strong but you need to start doing things right or we really won't be able to help you at all.