How do you know if the ghost in the house wants to be found?

There is a ghost in the house my sis and bro and I can hear it but it never gets near my bro just me and my sis it always tells my sis to be a bit more quiet and it call my name a lot and sometimes it fallows me to stores or to school and it wakes me up at middenight and when it wakes me up I always hear a lady and a man talking and diging a hole but when I check it's quiet and nothings there I'm scared of it but I want to know what it wants I think it wants to be found or something like that and meny times I think of digging were I hear the noses up I just get to scared and I'm the only one who can see it please help I don't know what to do