Paternal uncle as sponsor for UK plab 2 visa? [duplicate]

I guess I have a complicated case..

Well, my dad is a private lawyer and he invests the money earned rather than setting money aside in a bank. So, he has a lot of shares in primary and secondary market, but he hasn't been able to maintain a good bank balance as he takes in hand cash for his services and invests in real estate / share market within little to no time. Therefore, I opted not to show his bank account and put in my paternal uncle as my sponsor.

My paternal uncle has a reputable job in the banking sector and earns close to 6 figures. He has regular transactions coming in and going out of his account and has done the same in last 2 years as well. He has a good travel history to US, Australia, and several places round the globe, where he hasn't overstayed, ever. Now, like his previous transactions, he'll have a huge amount of money in his account from real estate, and it just so happened that it kind of coincided nearing my visa application date.

My query is whether he could back up his transactions for last 3-6 months ( major ones) including the last one in his sponsorship letter and provide in share papers, land ownership documents, etc. OR should I get the bank statements and transactions approved by chartered accountants??

And second query: Will shares serve the same/ similar purpose of "liquid assets" as cash in bank and whether i should show in my father as my sponsor instead?

Both of them have acres of land and houses in their names as well..

Please shine some light into this question of mine.