Can brown eyes turn hazel?

Just wondering because I used to have pretty dark brown eyes when I was younger but they have gotten lighter over the years and I can even see a little green in them now. Both my dad and my mum have hazel eyes so I was just wondering. I also have two sisters. One of them, named Molly has really dark brown eyes that she has had since birth and the other one, named Greta was born with light blue eyes that changed to a sort of sea green when she got older. My eyes still look very much brown to me. Not as dark as they used to be and certainly not as brown as my sister Molly but still brown. But I was just wondering can brown eyes go hazel and what are the chances of my eyes going hazel at this rate?