Share in the Money once the property is sold

Hi , I am the eldest child among 3, my sister is younger one and my brother is youngest. My father purchased a property in 1970 and we were living in that house. My father passed away in 2012. I got married in 2013 and my sister got married in 2016. Due to financial problem and my mother was diagnosed of Cancer, my mother and brother planned to sell the house. My brother told me that we would need money to take care of mother medical expenses and we need to sell the property. When i asked my share of close to 30 lakhs(considering my mother as also eligible for share), he told me that the money got once the house is sold we can use for mother hospital expense and once she gets alright what ever is left we can share . We found a buyer an we sold the house. Immediately we started her treatment . With gods grace she got cured and we had to spend around 10 lakhs and took a year. Now when i ask for my share from the left over money, my brother and my mother are saying that she has got me married and that only my share. She spend 5 lakhs for my marriage which is small compared to what share i was eligible( close to 25 lakhs now). I am cheated. Can anyone tell me if i cam approach the court for my share and if yes how strong will be my case.