grandcat , n :
(humorous, affectionate) A cat owned by one’s child, having a status comparable to a grandchild.
usufruct , n :
(law) The legal right to use and derive profit or benefit from property that belongs to another person, as long as the property is not damaged.
The tongue-in-cheek International Be Kind to Lawyers Day falls on this day in 2017, the second Tuesday of April.