A family of four living in a 2 bedroom apartment? Wow, that sounds miserable. Where are you going to find a 2 bedroom apartment in a good area for $700/month? My daughter's very small one bedroom apartment runs $900/month and my son's 2 bedroom apartment at college runs $1260/month.
$150/month for gas? Do you mean for one person or the entire family? Do you live like 5-10 miles from work and never drive anywhere else? Guess what? When you are raising a family, kids need transportation to friends homes, activities, school events, etc. You will spend considerable more than that.
As far as 150/month for a family to have cell phones/internet/cable - who is your provider? I would love to have that rate for my family.
$400/month for a family of four for food???? Have you been grocery shopping for a family of four? Are you talking about just eating rice/beans every day?
As far as those monthy miscellaneous expenses, just our medical insurance is over 400/month(company group plan). Both kids have chronic medical issues - just out of pocket prescription cost is 220-250/month. Car insurance for my wife and two college aged kids is $1900/every six months.
There is no mention of saving for retirement, college educations, supporting elderly parents, paying childcare when kids are small. How about saving for a vacation, furniture, electronics, repairs? Most people will also have car payments at some point and if attend college will likely have student loan payments.
Your figures illustrate you certainly don't have a family and have zero idea how many expenses are involved.