Shadow People Or Guardian Angel In Home?

A couple months ago, my girlfriend decided to let me know she's been seeing things around our home. I've lived here over a year and she's been here for about 6-7 months. We both believe strongly in the paranormal and spiritual. Her, her sister, and her sister's boyfriend all have gifts of seeing and perceiving spirits. I, more often, feel or sometimes hear them. She told me she sees a shadow of a woman outside, she'll just walk past the window, won't stop and look in or anything. But my girlfriend sees her all around the house, at any window. But she's never seen her inside. Another she told me about was in my 2-year-old daughter's bedroom.

She told me she was laying in Sky's toddler bed wither one night, trying to get her to sleep. But Sky kept whining while looking into the closet. My girlfriend said she saw a tall shadow in there. She told Sky that it was okay and it wouldn't hurt her, and that she was there to protect her. Since then, she hasn't cried about it or anything. The other night, me and my girlfriend were arguing and laid down to go sleep. And I felt something in the darkness, near my closet. I didn't want to look, being a scaredy cat. But later on the next day, she told me she saw the same shadow figure from Sky's room, but it appeared to have wings, and disappeared through the ceiling. She told me from the beginning that she never felt they were harmful or evil, but this time it felt like some sort of "guardian angel" type spirit, and it was either mine or Sky's.

Yesterday, my girlfriend's sister and her boyfriend came over. As soon as they walked up, we somehow started a conversation about spirits being here and whatnot. Her boyfriend looked me dead in the face and said "There definitely is something here, but I'm not sure what." He's had very strong connections with spirits and can sense them very easily. Later on in the night, me and my girlfriend were outside while I smoked a cigarette and we were watching something on her phone, when she said she heard someone say her name quite loudly, and like it was right in her ear.

I'm not sure if the spirits have an identity that they're trying to hide, or if it's just typical shadow people, or anything else. Does anyone have any idea or clue as to what could be going on?

And also, one time my cousin came and got Sky to take her out to lunch. She told me that while they were in the car, Skylar kept staring towards the car door like something was there, and talking (she can say a lot of words, but can't really do whole sentences yet). My cousin asked who she was talking to and she swore that Sky said "him", and it freaked her the hell out. I do notice both my babies (one is 2, the other is 1) stop and stare at nothing sometimes, and I feel presences quite strongly sometimes, but I can't see or often hear things myself.