Below is an instruction that describes a task. Write a response that appropriately completes the request in Thai. Please answer in Thai.

### Instruction:
Rick has just celebrated his 15th birthday. His oldest brother is twice his age, and his middle brother is a third of the oldest brother’s age. The smallest brother is half the middle brother’s age. If the youngest brother is 2 years younger than the smallest brother, how old, in years, is the youngest brother?

### Response:
 พี่ชายคนแก่: 15(2) = 30 ปี
พี่ชายคนกลาง: 30(1/3) = 10 ปี
น้องชายที่น้อยที่สุด: 10(1/2) = 5 ปี
น้องชายที่น้อยที่สุด: 5 - 2 = <<5-2=3>>3 ปี