To paraphrase a famed author
, it is a truth universally acknowledged that grandparents in possession of good fortune must spend a little on stuff for visiting grandchildren. When the grandkids are young, a few books, toys, diapers, activities, bottles, and dishes are simple enough to acquire and store, and ensure parents don't have to haul extra belongings. If overnight stays are in your future, you might consider a highchair, small stroller, or even a crib. Space and income will play a factor in your equipment list, but really, any effort will be appreciated.