ETA:
Been thinking about how to clarify what I meant overall...sorry, it's been a really hard day and I'm still near tears. Stress has the upper hand right now.
I am meaning to say this.
"Teacher, son had some homework this past weekend. He had read the information and tried to do the assignment but was unable to follow the (instructions/steps to do/how to format his answers/etc... and he asked us if we understood the instructions and how he should proceed.
I read the instructions and found them to be incomplete (?) confusing (?) too hard to follow (?) (insert your own words that make your point).
In the future please consider that an adult with more than a highschool education couldn't follow the provided information and as a result our child didn't know how to do this assignment. Please try to put more specific instructions in the future".
*********************************************
I agree with the teachers. Really. They do need to handle this.
BUT I would say that his IEP needs to specifically address this. Call a meeting and put in the notes that if he has homework he needs to have complete information for you, not the child, but for you. So that you fully understand what is expected and all pertinent information so that you know what they've been studying about Egyptian times.
I have our boy do all his homework at school. He's in second so he's not as old as your boy but still, if they have ANY homework is almost always done before he leaves the school.
I do think that you need to be an advocate for your son and you're experienced doing this. You can make it part of his plan.
Visiting with the teacher and letting her know your experience isn't going to help. You aren't supposed to be helping him this much. He should understand the material and know what to do before he leaves school. Then he should be able to do this himself.
It's your job to teach him and work with him at home BUT sometimes kids need to do it how they do it then take the consequences of not doing it right or even at all. You may teach him differently than the teacher wants it learned. You might also just really make him hate education and school by being on his case at home over homework.
There is so much research showing that kids who do homework actually make lower scores on tests and overall they have lower grades. Kids who learn and don't have that stress carry over to their home do much better with that separation.