This does seem to be a fairly straightforward matter in which you have very definite rights. Your father and his brother were in business together with a view to profit and accordingly a legal partnership was formed in accordance with the Partnership Act 1890. It will follow from this that the property they purchased was partnership property.
When a partnership is dissolved as has happened here, all the partnership property must be sold for the payment of partnership liabilities and the balance distributed between the partners. Your father will accordingly have an entitlement to this amount.
The property has now been transferred by deed of gift to another. If a person acquires a property for valuable consideration without notice of other claim is the property will be acquired free of those claims. Were this to be the case your father would not have the security of the property and would have to proceed directly against his brother. The position can however be very different when consideration was not paid for the property. This is something which will require further examination and with which I would be happy to assist.
As to the other question you raise which I am taking to be unconnected, a joint owner of property has a right under the Trusts of Land Act to call for a sale of jointly owned property which is held on trust for sale.
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• Get a divorce
• Have contact with my children
• Make a small claim
•Write a letter of claim
•Obtain a Grant of Probate
•Get legal advice and help with my case
•Make a Will
•Change my Name
•Prepare a legally binding agreement
• Sever a Joint tenancy
• Prepare a Partnership Agreement
• Sell a Jointly owned Property
• Appoint a Guardian for my children