The nature of property that devolves by inheritance, WILL, partition is; self acquired.
In case of Hindu male that has died without disposing self acquired property owned by him by a valid/registered deed/WILL; The 1st right for equal share is of his ClassI legal heirs i.e Mother ( if alive as on date of death), Wife ( if alive as on date of death), sons, daughters……….. The share in ancestral property devolves upon his legal heirs.
In case of Hindu woman the nature and source of property matters.
In case of Hindu woman that has died without disposing property owned by her self acquired/absolute property/estate by a valid/registered deed/WILL; The 1st right for equal share is of her legal heirs i.e Husband ( if alive as on date of death), sons, daughters………..
If the property is acquired from parents side the 1st right for equal share is of her legal heirs i.e sons, daughters………..and in their absence legal heirs of her father.
If the property is acquired from husbands side the 1st right for equal share is of her legal heirs i.e sons, daughters………..and in their absence legal heirs of her husband. The property from mother’s side is not ancestral.
You can determine the share of each legal heir accordingly and see how much share is vested in you (if any).
The process and procedure to get share updated in mutation records is simple.
The authority under whose jurisdiction property falls has a set procedure for such matters if NO WILL has surfaced; Intestate Succession…….and the prescribed forms, procedure, process is available in O/o Authority and even on website. Certified copies of the death certificate, legal heir certificate/affidavit (per local procedure/precedence) are basic requirements.
The authority shall update share as per provisions of personal law that applies in mutation records.
By the updated mutation records the legal heir(s) attain rights equal to that of owner and can enjoy/dispose the property/share like owner. The only thing remains is partition by boundaries. That can be achieved either amicably or thru court.
You will come to know if you have a share in undivided property or not, during the life time of your father and/or after the death of your father.
Thereafter you shall realize if IT is worth initiating any litigation or not.
You may try by asking your father to return the money supplied by you for building. However it may sound selfish.