In most cases there will be none. The estate was left to the brother.
If your father is deceased, it is a refusal to accept any proceeds.
The answer depends on whether your father's estate was probated and who owns the property now.
Your father's estate is responsible for his debts. If he owned any assets when he died his estate must be probated. You should speak with an attorney.
The imidiate family has the right to their fathers estate.
Your fathers brother is your uncle.
Your father's brother is your uncle.
Yes, a half sister can share in her fathers estate if she was the blood daughter of the father.
In most cases, the eldest child is not automatically responsible for handling their deceased father's estate. Typically, the responsibility falls on the executor named in the father's will or, if there is no will, on the legal heirs as determined by law. It is important to consult with a legal professional to understand the specific requirements and obligations related to handling the deceased father's estate.
Your uncle on your father's side is your father's brother.
You should be able to establish paternity by testing someone in the fathers immediate family, such as a brother, sister, mother, father, etc...the family of the father still carry his DNA even after he is dead.
If the girlfriend is still alive then she can change her beneficiary. If she died and didn't change her beneficiary then you may have a claim if her estate went to your father. You should speak to an attorney. You refer to a "policy holder" in your question as well as an "estate". If the subject is a life insurance policy and your father was the beneficiary but was deceased when the insured died then be aware that the girlfriend probably named a contingent beneficiary on her policy.
A father's younger brother is called "chhota bhai" in Hindi.