When you’re referring to the actual color of your eyes, you don’t need to use los before eyes. But let’s say, you get something in you eye that makes it a little red, or you cry a lot, or laugh a lot and someone asked you what happens with your eyes... you say, tengo los ojos rojos
Carlos y Sofia le escriben una carta a su familia.
That is the answer if the verb is "escribir."
Hope I helped!
:)
