Is it risk to claim grandmother's Property under Muslim Law

My grandmother and her two brothers inherited equal 1/3rd share in three properties by way of a settlement deed from their parents. My grandmother passed away in march'2017. before her demise, in 2014, my grandmother made a hibba (gift deed) in my favor, of her entire 1/3rd share in all three properties. q1) does the hibba (gift deed) secure my claim to the entire 1/3rd share previously owned by her?. is there any risk of claim from my grandmother's brothers or their sons (my cousins). please note, we are a muslim family. I am a grandson.