Hi Manaka,
It's good to see you. =) I'm sorry to hear about the bad experience you've had with the relatives/house guests. =(
Orbs are thought to be the soul or life force of those that have passed on... a ghost, in one of its many forms. It could be that the disharmony in the household attracted some curious, and possibly negative, energies into your house. I'm glad your guests are gone... Keep smudgin' girl!
Hugs,
Kell