Was our house haunted?

When i was younger, my parents threw a bbq ( the neigbours and family) and me my sisters cousins and nextdoor neigbour was playing hide and seek. I counted to 30 on the stairs then as soon as i opended my eyes, i saw a white flash - as if something was running across the landing and into my parents room. i thought i found the first person, but i checked the room and empty, they was all hiding on the bouncy castle. We always speculated if it was haunted, do you think it was?