Get two contact forms working correctly

This job should have been completed by another freelancer and wasn't. The first form attached fails to send the message to me, and also (if the date of birth shows that the person inputting data into the form is under 18) fails to send the user to the second form for parental consent. That may work, but I don't know because the first form definitely doesn't work. I'm sure it only needs the tiniest change but it's beyond my technical capability. All fields except SURNAME are mandatory. So, for the first form: if the user's date of birth indicates the person has attained the age of 18 then send the form to me. If the user's date of birth indicates that the person has not attained the age of 18 then send the user to the second form and make sure that is working. All fields are mandatory. Then send the message to me to include all of the fields from the first form in one message. Either way make sure the PHP send and thank you pages should also be working correctly. Please use the third and fourth files attached as samples but use different names. Change the layout of the navigation bar and the hyperlinks at the bottom of the page to be the same as the first form, and get rid of the unwanted graphics. Finally if someone manages to navigate to the second form, the CONFIRM page or the THANK YOU page without starting at the first form then redirect to the first form, so it can be completed first. I am aware there is some redundant code in these pages. I am happy with the iframes and all other aspects of the website. Please don't ask me to change them.