My Dad expects me to help him at his work during the summer holidays

This - I have a friend who works in a school and she has told me a few times that the way she is paid basically still covers school holidays. I don’t see having 6 weeks off as being “unemployed” in this context. That’s kind of ridiculous.
It’s even more ridiculous for your dad to think you’re unemployed, but not want to pay you if you did work for him. I know it’s not going to be easy, but I’d put my foot down here and say no - or at least, just help him when you want to and be unavailable otherwise! He has a massive cheek.

I do cleaning in a holiday camp and I am unemployed (by that company) between seasons. I have to register my interest to return when they reopen each spring, and obviously don’t get paid extra during the rest of the year to compensate!

The perks of working in a school is the holidays, why should you be made to work them?

I don’t think you should be expected to find work or work for free just because you have a job with good holiday perks.

As you said you have ASD I'm wondering if being out of routine is something that's caused you distress in the past and he may be suggesting the work from a place of genuine concern? You won't know until you talk to him though. Show him that you can advocate for yourself and make your own decisions then he may back off.

The dad wants them to work for free

Is it a family farm by any chance? Most farmers don't like to see anyone living on the farm idle whilst others muck in, especially unemployed people.
I haven't decided if yabu or not, you say you pay rent - full market rent? Or a bit of board? Do you cover all of your food, gas electricity etc? Ie are you living as a fully independent adult or a long term teenager pulling a face because you have been asked to help?
Need more info before deciding if dad is controlling or frustrated!

I agree with the others, just move out as it sounds like you're still in the parent/ child dynamic. Sounds like it's time to stand on your own two feet.

Either you pay rent and he leaves you alone or you don't pay rent and you work for him for "free" he cannot have both

Yanbu

Let him know your consultancy rate is £75ph if he wants your services. Otherwise your time is your own.

Probably best to move out asap.

He is only expecting you to work some days, so if we are talking about 1-3 days a week and you still have 4-6 days to rest I would say it is a grey area. You are an adult and you work and pay rent BUT you are living in your parent’s house so fair enough that their rules include helping out on day when there is no work.
Bottom line: if you can afford to move out, do. If you can’t because they are heavily subsidising you then asking for a few days of work every week over the summer seems fair.

If he sees you as 'unemployed' then why isn't he offering to pay you? Surely it would make more sense for you to get a paid temporary job than work for him for free anyway? He can't have it both ways.

No. Family members are not obliged to work for free for other family members, just as parents of adult children aren't obliged to let their adult children board with them for free.

Tell him if he can't cope he should advertise for an assistant.

I'd also think about moving out.

I don't work for my family members for free during my holidays no.

Pick up shopping or drive them somewhere if they need it yes.

Why would you not help your dad out? Isn't it what families do?

He should pay you for your work UNLESS the rent you are paying really doesn’t cover your expenses and he is, in effect, partially supporting you financially - in which case you should help out for free imho.

Of course YANBU. But it's time to flee the nest!

1. Even if you had a full-time contract you are not paid for the holidays, you would work 192 days, 1265 hours + directed time - and all that is encapsulated in term time. However, unlike f/t contracted teachers you are not paid pro-rata across the holidays but only for days worked (which means you are being paid less per hour than a contracted teacher btw).
2. You are unemployed as a supply teacher, if you do not have a contract anywhere and you could claim benefit for the holidays, in which case you cannot work in your dad's business as you would not then be available for work.
3. If your dad wants you to help him in his business he should pay you the going rate. You pay rent, so are not free-loading. Point this out - you don't have to be confrontation, just factual.
4. Have a good summer. Go on holiday.

Are you paying market rent or reduced rent to live there? It's not unreasonable of him to ask for help if you're presumably not paying market rent.
When you work supply do you always get full time work or is it more adhoc.

Do you do a third of all cooking and cleaning and more when off?

I voted that YNBU but I would recommend moving out so that this 'hold' that your father has over expecting you to be available to him to work in his business would cease.
He should be paying you though and you should tell him that you will work for him for the time you're off (so long as you want to that is) so long as he puts you on the payroll like any other employee. Not negotiable.

If you pay rent, regardless of how much, then you're entitled to live there.

If he wants you to work, then he needs to pay you. If he doesn't pay you, he's not entitled to your labour.

Move out.

Sorry, missed the fact the OP is a supply teacher. If your Dad wants you to work then he pays you NMW at the very least.

But teaching staff get their annual salary e.g. £20,000 spread out over the amount of months they are working but still get £20,000 pa don't they? They are not unemployed during the holidays as they are still on the payroll.

He may just want to spend time with you, I wouldnt advise going too overboard with the work sans payment though!

YANBU - I don't think he should expect you to work for him. What is the work? Is it something that he struggles with? Maybe you could give him a few hours a week?

Your time off is part of your job. If you feel the need to work during this time, no doubt you'd want paid work?

Time to grow up and move out