Deceased Estate

My father passed away nearly 3 months ago.
Currently his estate including a property is going through the probate solicitor.
The solicitor has indicated for me if I wish to send a written proposal to him
with a view to my buying out my brother and sister. We are all equal beneficiaries. We have about $30k cash coming to us and
the property is worth about $500,000 or maybe more.
He (solicitor) will present my wishes to my sister who is the nominated Executor of the proposed estate.
Both my siblings have personality disorders and are difficult to engage in a business like way.
This is partly why the solicitor is assisting me.
I am highly interested as the property is in a very good suburb in Adelaide where I live. The house is very run down though.
My situation is a bit tricky but also some good aspects as well.
I am on Centrelink (overcoming a disability) but have two subdivided and rented properties earning about 10% return, one of which I have for sale right now at $185,000. It is in a country town so may be a bit slow to sell.
I have a mortgage of $133,000 and have now been to three banks to see what they can do for me. The best loan offer
I have so far is that of $200,000 if I rented out my father’s property for at least $250 per week. I would seriously need to do repairs and major clean up of the my father’s house to make it habitable.
Do any of you more experienced property investor people have any ideas on what would be my best course of action in all of this?