SnakeNewbie, I haven't read all of your threads, but I know susang well enough to trust her judgement. It is quite obvious that you're being impulsive and not listening to the good advice being given to you. Yes, many of the members here can be quite harsh with their comments, but we are all very passionate about our snakes and only want what is best for them.
Your Dad needs to be told that this site is the LEADING source of information concerning corn snakes and their care. It's owner is one of the "BIG 3" in corn snakes. Rich Zuchowski of SerpenCo, Kathy Love of Cornutopia and Don Soderberg of South Mountain Reptiles are the leading breeders of corn snakes. Kathy and Don have actually written the books on proper corn snake care. All three are active members of this site and we have all learned from them and are still learning.
Cohabitation has been performed successfully by quite a few breeders...until something goes wrong. For as many people that say they have never had a problem cohabing corn snakes, there are just as many that used to cohab but stopped after something bad happened. At this point, you can simply split your tank in half as a 10 gallon tank is more than ample space for hatchling corns. That will give you time to get a second tank for your second corn.
And please, rethink the heat lamp. I have no idea why you changed from an UTH to a heat lamp. Heat lamps cannot be regulated and can give off too much heat, literally cooking your snakes. Corn snakes do not bask. They naturally obtain their heat from underneath. And if you then decide to get a hot rock instead, you should never own a pet of any kind and be brought up on charges of animal cruelty.
At 13, you needed your parents permission to become a member of this site (unless Rich changed the rules), which means that at least one parent thought this site was good enough. THAT is the parent that we need to talk to right now.