So, are all adjectives after the noun? This cannot be translated as a statement? IE "The children are yours."
I am not sure about your first question. "Watoto wako = your children " this indeed is a statement. Did you mean to say a complete sentence? "The children are yours." will most probably translate to "Watoto ni wako" but this is just a guess. I may be wrong. Afterall, today is my third day learning Swahili (05 Mar 2017)
Yes, adjectives are usually after the noun (few exceptions) - You could shorten "Hawa ni watoto wako?" (Are those your children?) To "Hawa watoto wako?"