This is m second flag. 

As a lender it is a big red flag for me when I ask a potential borrower what the ARV and rehab budget is and have them say "well, the wholesaler says xyz".   

Being able to pick their brains is always helpful, both their successes, red flags, war stories, etc.And as Jonathan mentioned, the very first step of actually taking action is knowing how much money you have to allocate to buying a property, fixing up a property (if needed) and how much a bank will lend to you.  

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

Quote from @Zachary Deal: Thanks for flagging Robert!

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

It is seen as a red flag by a portion of the parents.

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. 

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!