outkeeper
/ˈaʊtˌkiːpər/Definitions
1. noun
a person who takes care of something, especially a property or a place, while the owner is away
“The outkeeper of the mansion made sure everything was in order during the owner’s trip.”
2. verb
to take care of something, especially a property or a place, while the owner is away
“She will outkeep the house while the family is on vacation.”