Controlled with the Left Analog Stick and Left Trigger (L2/LT) . He is stronger and can pull heavy levers or boost the younger brother to higher ledges.
The younger brother is afraid of water. When crossing rivers, have the older brother swim first; the younger brother must grab onto his back using his interaction trigger (RT/R2) to be ferried across. 100% Achievement Guide (Missable Secrets) Brothers-A-Tale-Of-Two-Sons.rar
The game's defining feature is "single-player co-op." You must control each brother independently using a single controller. Controlled with the Left Analog Stick and Left