Pictures, card stock or laminate, hole punch, length of ribbon.
This is the grown-up version of the Who Loves Baby book that both my kids adored. Take photos of family and friends who don't live nearby and adhere them to card stock or have them laminated. Then either use them like flashcards or punch a hole in the corner and fasten them together with a ribbon. Either way you choose to do it, you can sit and talk with you child about who's in the picture and even recall the last time your child saw that person. This helps family seem more familiar next time your child sees them!