The Allen family is a prominent family who primarily live in Central City.
Known family members
Earth-1
- Barry Allen's great-grandfather (Barry's paternal or maternal great-grandfather and Nora's future paternal great-great-grandfather; status unknown)
- Barry Allen's great-grandmother (Barry's paternal or maternal great-grandmother and Nora's future paternal great-great-grandmother; status unknown)
- Henry Allen's mother (Henry's mother, Barry's paternal grandmother and Nora's future paternal grandmother; status unknown)
- Henry Allen (Nora's husband, Barry's father, Iris' father-in-law and Nora's future paternal grandfather; deceased)
- Nora Allen (Henry's wife, Barry's mother, Iris' mother-in-law, Nora's future paternal grandmother; deceased)
- Barry Allen (Henry and Nora's son, Iris' husband and Nora's future father)
- Iris West-Allen (Barry's wife, Henry and Nora's daughter-in-law and Nora's future mother)
- Nora West-Allen (Barry and Iris' future daughter, Henry and Nora's future granddaughter; erased from existence)
Earth-2
- Barry Allen's father (Mrs. Allen's husband, Barry's father and Iris' father-in-law)
- Barry Allen's mother (Mr. Allen's wife, Barry's mother and Iris' mother-in-law)
- Barry Allen (Mr. and Mrs. Allen's son and Iris West-Allen's husband)
- Iris West-Allen (Barry's wife and Mr. and Mrs. Allen's daughter-in-law)
Earth-3
- Jay Garrick's mother (Henry's mother doppelgänger, Jay Garrick's mother; status unknown)
- Jay Garrick (Henry's doppelgänger)
Earth-27
- Barry Allen (Barry's doppelgänger; deceased)
Earth-90
- Henry Allen (Nora's husband, Jay and Barry's father, Eve's father-in-law, Shawn's grandfather)
- Nora Allen (Henry's wife, Jay and Barry's mother, Eve's mother-in-law, Shawn's grandfather)
- Barry Allen ( Henry and Nora's son, Jay's brother, Eve's brother-in-law, Shawn's uncle)
- Jay Allen (Henry and Nora's son, Barry's brother, Eve's husband, Shawn's father; deceased)
- Eve Allen (Henry and Nora's daughter-in-law, Jay's wife, Barry's sister-in-law, Shawn's mother)
- Shawn Allen (Jay and Eve's son, Henry and Nora's grandson, Barry's nephew)