It's difficult to help with this question, since your assignment is filling in the blanks based on your own room and a siblings room...or a TV show room. What part are you struggling with? Are you able to fill in any of the chart on your own? That would help a lot to start writing sentences.
Lets start slow and work through it. What does "mi dormitorio" mean in English? What does "su dormitorio" mean in English? And, last, what does "los dos dormitorios" mean in English?
