I too would have answered differently if the Autism part had been mentioned.
Teaching something to a child with autism is a judgement call. I'm going to say thins but please don't take it that I'm being mean or disrespectful okay? I have almost 15 years of work with people with developmental disabilities.
I've spent hours and hours, days and days, months and months working with people to achieve one step towards a goal.
For instance...a person has a goal of becoming more independent.
The steps to implement this goal are various.
Writing letters and numbers so they can write a check and manage their own money
Learning to do basic math so they can buy a pop at the sheltered workshop
Learning to do their own laundry, making a shopping list off their own made up menu, finding items in a grocery store, and more. The list is endless.
In business, to get funding, we have to show we're teaching people skills that will make them less dependent and more able to live on their own.
When it comes right down to it most of the people who live in group homes and even in sheltered living situations aren't ever going to live outside of a supported environment. They can work for years learning to write basic letters/print and they'll never ever have to use cursive.
If your son's autism is going to limit him as an adult then the skills he's learning now aren't going to really really really make a huge difference, this is the part that's not meant to be mean.
He can learn, obviously, and some people with autism live, marry, work full time high stress jobs such as physicians, nurses, teachers, and more. They can learn and be productive. If your son's autism falls within the boundaries where he's higher functioning then he does need to work on these skills because he'll eventually be able to go to college and out in the work force.
But if his autism limits him so much that he won't ever be able to go out and do those things then help him focus on the things he will need or hope to need as an adult. Like printing and doing basic math and reading.
I don't mean to be negative or unsupportive. I've seen parents who put their small children in institutions because they were told their kids were ineducable, not able to be educated. One of those ineducable kids grew up to work in a grocery store, stocking, running a register, ordering stock, etc....his parents take his entire paycheck and give him a $10 allowance because "he's retarded, you know". This guy can function quite well and when his parents die off he'll finally be able to move out and have a life.
Then I've seen other parents who'd beat their kids while they were trying to do homework and those kids had learning disabilities where that topic was impossible for them to learn.
So please, take what I've commented with and consider what he'll use as an adult, only you have the information that says what his levels are, and try to focus on things that will make his adult life more able for him, where he can function at his highest level and be happy.
If writing in cursive isn't one of those then don't fret over it so much.
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They don't teach cursive anymore.
The school teaches handwriting so it won't be anything on you even if they do teach it where your kids go.
I do think they need to know how to do it. I can write a lot faster if I use cursive. I also think that the kids are growing up in a different world and learning to type is way more important that cursive. Learning cursive should still be taught in my opinion but not totally focused on for hours and hours.