That put another $6000 in their pockets.Rental assistance is common and widespread.

Is this something folks do commonly? 

They are also known to mismanage money, which can result in huge assessments for common area improvements.

The child's father is not applying for tenancy, but I just didn't want any problems to arise if he was still in the picture.

@Ricardo DiazYou are filing your taxes incorrectly if the property is owned as tenants in common and you are reporting 100% of the rental activity.

We’re familiar with the more commonly discussed routes of how to go about doing this, such as:Going to friends and familyCrowdfundingEquity/HELOC/House hackingPrivate moneySubject to/wholesalingPersonal loanRetirement borrowingGrantsBut we’re pretty sure we haven’t thought of everything. 

To your point, 75% leverage doesn’t always work—65% is common.  

The obvious ones are saving them the hassle of listing, and saving them money on agent commission if they choose not to get an agent; but I am sure there are other creative suggestions out there.Is it pretty common for the buyers agent to act as a dual agent in situations like this?

@Kenneth Rolfe same as @Mason Hickman, I've done this a few times, but it's not common.

Unfortunately that is a very common thing here.