Provide a deadline for this addendum to be returned to your office at least two weeks prior to the effective date.

Send them a notice to cure with a deadline.

You need to send notice to the daughter about next steps and include a deadline. 

Coordinate access and a deadline for removal.

No checking with a lender or partner, no HML deadlines and risk, minimal costs, fast closings, ability to buy houses that need too many repairs for a bank loan or able to buy 'unique' property like mobiles on land, industrial or commercial hybrid like an office with self-storage in back. 

I keep a master spreadsheet for all tax liens which includes the purchase date, price, interest rate, all the deadlines, and the current status.

I don't want this to come off as mean spirited, so please don't take it that way, but the fact that you know so little about binding contracts, and how the sales process goes is probably evidence that you SHOULD have an agent guiding you....at least on the first deal, so you can learn the process, the contract deadlines, what you can ask/demand of the Seller, and what is expected of you. 

John Colin Rogers If I were in your shoes I would create a plan for the next 5 years with your long term goal of doing whatever thing you want to do in real estate, then start breaking that goal into smaller goals and set deadlines for them, more importantly have urgency in accomplishing them.

If the eviction is solely about rent, I explain we do not want them to move out, we just want them to get to a zero balance and this process gives us a firm deadline.

Yes, they keep pushing their deadline to start operations and there is little sign of actual investment in production capacity.