PUZZLEBOXX

Possible answer #1

Keisha is a 1-year-old child.  Her mother is 35 years old but her father is only 20.  His mother (Keisha's grandmother) is 40 years old - just 5 years older than Keisha's mother.

Possible answer #2

Keisha is a child.  Her mother and father are 25 years old.  Her grandfather is 50.  He has re-married and his new wife (Keisha's grandmother) is 30 years old (only 5 years older than Keisha's mother).

Possible answer #3

Keisha is a cat.  (... or a dog ... etc.)

NOTE: The answers and ages given here are just for example.