How much does it cost monthly for Verizon?

Okay, I'm 14 years old & I had a question about the Iphone5S. Well, there's this deal going on at my local Walmart where they lowered the price of the new Iphone's if you sign up for a contract or something (I'm new at this whole phone thing with the contracts & stuff) & it's like this 2 year contract. Well, they said that the IPhone 5c will cost only $27 with the new 2 year contract with Verizon & the IPhone5S will cost $117 with the 2 year contract. My mom said she wants to do a family plan thing with her, my brother & I. We would all be getting the IPhone5S since that seems to be the better deal to her. She said "go big" or go home. Lol. Right on mom. Haha. Anyways, I was wondering how much it might cost monthly because the girl at walmart said it all depends on your credit. & that would tell you how much you would be paying monthly. She was like throwing a bunch of numbers around on how much it would be monthly & she said $50.Is $50 per month for all that too good to be true or could that be like normal because were buying like 3 phones. I was just wondering becaye my mom said she wouldn't be paying like $200 monthly & if that was the situation. She said we wouldn't get them. It would mean a lot if you could help me out with this question.

Its going to be closer to the $200 mark. I went in to get info on a single line and it was $100 a month for a single line.

I remember the family plans being ~$60 per line so multiple the number of phones your getting by that and then add on another $30 for all those things they don't tell you about and that would be close to what you'd pay.

The absolute cheapest family plan is $160/month plus taxes and you basically get no data - 500mb to share among 3 phones each month.