Without naming any sources or the distribution ratio between the 4 mentioned mediums, it is difficult to determine from the user's end. 

My fathers trust stipulates to "divide or distribute property in cash or in kind or partly each"   I am going to take my interest in the property as 1/3 of the property and will be buying my siblings 2/3 interest in the home from the trust.   

Any 'investment' can act as a 'retirement'.Roth is great because it is tax freeI personally like real estate also becuase your cash flow is normally shielded by depreciation.I like real estate further because there is less complixities / restrictions when it comes to IRA such as the 5 year rule, year you have to take distributions, RMD, Unrelated Business Income Tax(UBIT).Your goal is to have the best return and the most money at the time of retirement, what is the best way to get there?

All deals have their own unique structure and you should understand the advantage and disadvantage to taking distributions along the way vs. a higher payout of profits at the end.

After the sale, any excess proceeds from the foreclosure sale may be distributed to the subordinate lien holders.Notice must be given to the IRS and U.S.

@Jon Dawes the best technique here is to lean on other investors in your market. 

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That way there was transparency on what your balance/distributions should be.

As you know since you're over 59.5 you can take distributions without penalties so you'll have to decide that along with your tax professional.   

As the IRA account owner, you can take distribution from the IRA, subject to applicable taxes and penalties.