I saw some of the properties with status "Occupied", "It's unlawful to disturb the current occupants" and "Buyer is responsible to obtain possession of the property" . 

The divorce gave your mother POSSESSION , but may or may not have also addressed OWNERSHIP.It also depends on the current type of deed recorded on the property.

(a) Upon termination of a rental agreement, a landlord shall return to the tenant the security deposit minus any amount applied to: (1) the payment of accrued rent; (2) the amount of damages that the landlord has suffered or will reasonably suffer by reason of the tenant's noncompliance with law or the rental agreement; and (3) unpaid utility or sewer charges that the tenant is obligated to pay under the rental agreement;all as itemized by the landlord with the amount due in a written notice that is delivered to the tenant not more than forty-five (45) days after termination of the rental agreement and delivery of possession.

Follow the procedure and take possession.

Pg 25 "If the landlord locks the tenant out of the leasedproperty, puts the tenant’s possessions on the street orotherwise takes the law into his/her own hands, thelandlord may be liable for damages for wrongfuleviction."

As of now, I could have the unit cleaned out in 1 day, have my garbage truck driver pick all possessions up for $100 bucks, and start over.

Once you purchase the certificate then you wait to be paid, if the property owner refuses to pay the certificate owner will ultimately gain possession of the defaulted property.

He said he will not walk through until end of September and refuses to take possession on September 18.

If you claim its cash on hand they will want to see bank statements showing the money is in your possession for 2-3 months.

For those experienced in purchasing tax liens, I am interested in making a definitive thread that defines that steps to take to prepare for and purchase tax liens.In my state the sales are in August, in June our state SOS puts out the sale dates for each county and I can look up property adresses and amounts owed for each property.Where do I start in terms of due diligence, obviously I want to go take a look at the property, and in my case I was thinking of keeping an eye on vacated properties as my main intention with tax lien investments would be to acquire the property (although I will take a 12% yield even if I don't end up foreclosing and taking possession).What exactly do I look for besides the condition and location of the property, etc.