Also, if you have worked with house movers, any advice on things I should avoid or red flags with these guys?  

Think lenders, insurance carriers, property management, contractors, etc.

Insurance is done with a carrier that allows for undergrads (usually Foremost).Re: legality, this is specific to the town.

Any additional due diligence questions or red flags I should look out for. since its my first time to invest in multifamily3.

Both the daughter and Dad have excellent credit history but feel this is a red flag. 

If a company is unwilling to provide this information it would immediately throw a flag for me and create distrust. 

it's not necessarily a red flag - it's because there is so much demand right now that they can pick who they work with.so... it's just tough =) Yeah, this goes both ways.

Do your research on the forums for general tips on hiring a PM, what to look for, what to look out for, good stories, bad stories, learn from others about their experiences with all kinds of PMs all over the place and take what you learn when you're speaking to PMs in your area so you can more easily see red flags, or green flags!

There are hundreds of carriers here but. 99% will not insure a roof over 20 years.

MInut has a low average review (mid-3s I think) on Amazon which is a bit of a red flag. 1 per room at a total of $60/month sounds excessive for something that is not likely to be a common occurrence.