So many Landlords treat tenants like babies instead of like adults. 

Most likely he is an expert on whatever his perseverations are, and if you have a question about about his special interest,if he does not know the answer he will research it and tell you]Our 'weirdness" is why we are treated as "less than" to such an extent that for those of us who are Autistic, 95% of us [ both male and female] have been sexually abused [ being too weird to be human makes it okay to those who hurt us I assume] and we are 28 times more likely to attempt suicide. 

Like you, all adults (age 18 and up) must fill out a separate rental application with application fee.

if we elect to shop on the market place for something competitive based on our actual need for doctor visits (besides delivery and baby checkups, we are both rather healthy adults) it seems so overwhelming trying to navigate all the options....deductibles, co-insurance, hmo, ppo, in network, hsa max out of pocket...im confused!!

Family planning to move in has 2 adults and 7 kids and we don't think the house can handle 9 people especially the toilet/bathroom with old sewage/septic system.

Also, in my city there is a 2 person per bedroom limit, and they have two adults and two kids there already (2 bedroom).

Longer driveways can hold two cars.I seen these situations, and the problem arises when you rent a unit to 4 or more adult tenants, have 4 or more cars, they don't have enough room to park on site, use limited street parking in front of other people's homes, which escalates into ugly disputes. 

So two full time adults with minimum wage could afford that.

Tenant has adult son that lives in the appartment.

I have to explain what the title company is, and why we use it to protect both parties.Seriously, I've been a sales guru most of my adult life, and if not for being honest and having integrity, I could get 99% of adults to sign a blank contract, then tear it up and tell them how stupid that was, and why they should never do that, then 15 minutes later I could get them to do it again...