Spooky Little Spirits Roam Their Home

Shortly after moving into the house, I was trying to go to sleep when I felt the bed shift at the end like someone had just sat down.

Thinking that it was my daughter, I sat up to tell her to go back downstairs, but no one was there. After a few seconds, 

I laid back down and felt the mattress rise up as if someone had gotten off the bed. And when my youngest was a baby, she used to 'follow' something through the house. Sometimes out of nowhere, she would stare and point, especially up the stairs to our bedroom. We've talked to our neighbors and one of the grandmothers who visits from Mexico says that when she comes here to visit, she sees a little girl and boy at our house. We only have daughters.