My mother recently died. I just discovered a record on-line of a Grant Deed in my sister's name (dated 16 months ago), for a house that was my mothers for 50-some years. Since my mother was very ill for the past two years (and her will states that the property is hers alone, and to be divided among three siblings), we suspect that my sister had undue influence on her.
What are the time-lines involved in challenging a Grant Deed, and what court would we file in (Probate/Civil)? Thank you!