Ghosts

i am interested in ghosts and spirits. i lived for 10 yrs in a house in an estate.the estate was built over a mass graveyard apparantly.my babysitter was the first to see a little girl who sat on the stairs and peeped through the banisters. when she told my daughters who were around 5 and 7 then they said , yeah , we have seen her too. we had no fear of her but when my son was about 18 mths i heard him in the night . i went to his bedroom door and he was chuckling and laughing with someone.after that i woke up and the little girl was sat on my bed when i woke in the middle of the night.i was nt scared. we built a new house and the atmosphere is so different in it. i,m never scared at night even if i,m on my own and the house is in the country . in the last house i never felt totally safe at night . i often wonder who she was.