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

### Instruction:
Susan, Arthur, Tom and, Bob are siblings. Arthur is 2 years older than Susan, and Tom is 3 years younger than Bob. If Bob is 11 years old, and Susan is 15 years old, how old are all four family members in total?

### Response:
 Arthur ni miaka 2 mkubwa kuliko Susan, kwa hivyo ana miaka 15 + 2 = <<15+2=17>>17.
Bob ana miaka 11, kwa hivyo Tom ana miaka 11 - 3 = <<11-3=8>>8.
Kwa hivyo jumla ya umri wa familia hii ya wanne ni 11 + 15 + 17 + 8 = 51.