Concept:
Hereditary spherocytosis is an inherited hemolytic anemia due to red cell membrane defects. It commonly presents with jaundice, splenomegaly, anemia, family history, and increased MCHC.
Step 1: Identify hemolytic features.
The patient has:
\[
\text{Fatigue + jaundice + splenomegaly}
\]
These suggest chronic hemolysis.
Step 2: Use family history.
His father had similar chronic anemia and underwent splenectomy, suggesting an inherited hemolytic anemia.
Step 3: Use MCHC clue.
High MCHC is a classic clue for:
\[
\text{Hereditary spherocytosis}
\]