Property matter

You have posted that you are all Hindu?

The said property is agricultural land, rural, Urban, or it is a building?

Have the deceased i.e. your father, mother, left any valid WILL?

The property is in which state?

Is IT narrated in sale deed that funds are made available by you and is for future use?

Confirm!

GO thru;

Central Government Act

The Hindu Succession Act, 1956;9,10,14,15

https://indiankanoon.org/doc/685111/

As per your post the nature of property may be self acquired/absolute…

Succession opens on date of death.

Succession of Father and Mother and has opened on their date/month/year of death.

Daughter being ClassI legal heir of Father and legal heir of mother has 1st right for equal share in estate/property whose title is in name of her Father and Mother and that is left un-disposed by Father and Mother in their life time by any valid/registered deed…

Payment made by you (brother as in query) does not place any bar on your sister to approach you or courts for equal share/ a share …..

SO she can approach you or courts of law..

Rest is matter of facts and arguments in courts and court shall decide the matter per facts and merits..e.g; Parents had NO income to buy the property and whole proceeds were made available by you to buy the property..out of your personal funds ..

Other than disbursement of funds there seems to be nothing reduced in writing that the property is paid for by you and for your future use and benefit.

Sons and daughters can maintain parents.

The monthly amounts sent by you to parents can be settled by you as personal matter with your sister.

The option to settle the matter amicably outside the court remains open and if you wish you can settle amicably ……………. Registered Family settlement deed can be good option and may leave NO scope for future litigation.

Daughter is legal heir in personal laws quoted by you, also.