Is my one year old seeing ghost?

it's the strangest thing like ok we have nothing in our living room because we just moved in our house but my son will look in the living room with a scared look on his face and shake his head no like he's responding to some one or some thing and my boyfriend don't wanna believe some thing might be here but my 12 year old stepson said he feels their might be some thing here but my boyfriend doesn't want us talking about it but i'm scared it might harm my kids and it makes me sad that my one year old is seeing some thing and i can't stop it what do i do? HELP