I am inheriting a property in CA with my siblings, the property is in an irrevocable trust and I am looking to buy them out.    

If you're curious about the loan process, you could start by looking at a company called Commercial Loan Corporation, who often specializes in loans to irrevocable trusts and is very familiar with the loans in regards to the property tax savings; my recollection is that they have some marketing materials on their website.

<< This legal site says >> Creating an irrevocable trust could be a possible solution to avoid Prop 19 taxes.

Figure out what you are trying to accomplish, and then look for the simplest structure that will accomplish that.Generally working with irrevocable trusts is primarily an estate tax planning tool. 

It was in an irrevocable trust (thank god... as she needed to go to a nursing home later in life).

Does it matter if it is an irrevocable living trust or just a living trust?

The biggest risk to me is being taken to court by her family who will inherit the deed.Is there some creative way such as setting up an irrevocable trust so that upon her death, I inherit deed to the property and her family inherits a note to what I still owe?

Eventually this property will be transferred to my wife (through inheritance or irrevocable trust).

Typically are land trusts irrevocable or revocable trusts?

Just trying to learn, will an irrevocable statement (mixing another language like an Irrevocable Standby Letter of Credit / Irrevocable SBLC) or something similar of an instrument where both parties cannot take back what is in writing UNLESS another instrument is provided before the original is due.