I want to make my special power stronger,how?

When I was 10 I could sence spirits.When I was 12, sitting in my moms friends car,I had a vision of someone who was close to me die in a semi reck.I couldn't see who it was.So I asked my moms friend did any of my relatives die in a semi reck.She said not that I know of.So I didn't tell her about what I saw.When we got into my driveway my mom came out bawling,sating that our Uncle was dead.That he died that day in a semi- reck.I told my mom what I saw an told me that she and her mom and her moms mom has seen things happen before they happened.But, none of my relatives wanted to make they're special powers stonger.But,I do.So if anyone could tell me a way I could make this stonger please tell me.