Pictures that feature the Emiya Family, (i.e.) Emiya Kiritsugu, Irisviel von Einzbern, Illyasviel von Einzbern and Emiya Shirou doing family-esque business.
...and sometimes also Archer, since he is the future self of Shirou, after all. Chloe von Einzbern can also be included here.
Can be Fate/Zero, Fate/Stay Night or Fate/Kaleid Liner Prisma Illya themed.