How did one sibling get the property and the other sibling get nada?  

Here is a copy and paste from the IRS publication involving prohibited transactions:"[NOTE: The term “disqualified person” under the Internal Revenue Code does not include siblings (brothers and sisters) or aunts, uncles and cousins of the IRA owner.]

The father was the builder and its now owned by 3 siblings of the second generation.It should be 100% depreciated.I don't know what the FMV was 9 years ago.So with the built in gains tax the rate is 35% on the entire thing for all 10 years, and then the next day it drops to capital gains rate of 15%?

@Bob MaleckiA sibling-in-law is absolutely not a disqualified party.  

The siblings would manage the house.

When sellers are selling a property, typically elderly or properties in a trust that have multiple siblings, I find there is a tremendous amount of mental pressure on the seller(s) to move the property.  

(I am one of two siblings)Again, not understanding the basics ,we would like some general ideas of what we need to think about before we engage in any deal.

My father recenlty put a 100+ year-old two-unit rental property in a trust which includes my father, me and two siblings.

.,  DST's and their older sibling the TICs and their 800lb gorilla cousin the NNN lease can all be great products to move into if you like real estate investing but don't want to be a land lord. 

In the first case of mine I learned through the neighborhood grapevine that the owner had passed away and his siblings 'owned' the place now.