My father purchased a residential plot in Haryana (under HUDA scheme) in 70s he died within four years from the date of purchase after death the plot has been transferred to his legal heir my mother. We are real 5 bros. & 5 sisters all the adult children signed NOC while transferring the plot in mother’s name in late 70s. It was later registered and conveyance deed was made in my mother`s name in 90s. This plot was sold out in late 90s and we purchased a society flat in Delhi from that amount. At that time the flat was purchased in GPA but later in 2010 it was made free hold after paying proper duties and conveyance deed was made. I am the youngest child (real Son) so my mother has transfered this society flat due to love & affection in my name through a registered Gift Deed in presence of 2 witnesses in May, 2010 but there is cataract operation performed in one of the eyes of my mother in June, 2010. My mother expired in June, 2013. After her death one elder sister and two elder brothers of mine started objecting that this gift deed was made forcefully and fraudulently by me. They`ve planned to file a suit claiming that this flat purchased from the source of father`s plot sold amount. My mother was in full conscious in 2010 & in 2013 she was died due to brain tumor which was detected in 2013 only. All the medical expenses of mother were borne only by me and I have medical bills and reports with me. Now, I came to know that my sister and brother has planned to take a stay on sale purchase of flat through the gift deed and trying to prove that my mother was not in her wits and of unsound mind and blind in one eye during the time when gift deed executed ( actually it is not true). They have also arranged a true copy of my gift deed from the Sub-registrar`s office and also arranged the medical bills that mother was not in her wits in 2010. They have arranged all the documents after the death of my mother in 2013. My concern is that should they take a stay on my gift deed after filing a suit on the basis of cataract in one eye, source for the purchase of this flat i.e. after selling the plot which was earlier in father`s name, later transferred in my mother` name and sold out this flat was purchased in mother`s name only in late 90s and do they able to make the gift deed void in future on these basis. Please help.