Purchasing property shares from an heir

[Nixon Vayupak]

I have an interesting Probate situation and I need some creative thinkers to help me find a solution. There was a mother who lived in southern CA  and passed away last year.  She has a son who lives in the east coast and an ex husband who lives in northern CA. Ex-husband and mother (decedent) are both on title. The son informed me, that after his mother passing, he was given her share of the property and been given the wonderful task of being the Executor of her estate to handle her affairs.  The son would like to sell his share of the property to me at a discounted price to avoid future headaches dealing with the ex-husband. From what I was told the ex-husband did suggest that he is willing to buy the son out, however he changed his mind and communication completely halted.  What should I do in order to make this a win win situation for all?  @Rick H. I am pretty sure you came of across this type of situation numerous times in this niche arena.  Would you happen to have any interesting tips I may use? =).  Thank you all in advance.. Nixon