Im not excited with announcement of the first grandchild

Ridiculous of them to continue with the pregnancy when they're so young, have no accomodation of their own and jobs that don't sound great.

Why didn't they wait till they were properly secure before bringing a child into the world? Is your daughter determined to continue with it?

To me it sounds like you're not delighted with the circumstances in which you're becoming a grandparent and I'd agree that it's very far from ideal. I'm sure if it was a decade down the line you'd be very happy.

I'd make it very clear that living with you has to be temporary and they need to find their own place. If they think they're ready for a baby then they're ready not to rely on parents to house them.

Are your children no contact with you? If so I’m not surprised 🤢

I mean yanbu, but your dd will really need your support. They are very young.

Luckily the early days don't require much stuff, pushchair can live in their car, cot, some clothes can live in their room. Bfing doesn't need much stuff (unless pumping too) and nappies are small at that age.

I would set a very hard deadline by which they have to move out and put a rent increase in place to reflect the deadline. Make sure it is before the baby will be six months old. You need to be so clear they aren't welcome after that date and stick to it.

You can give it a few days for the dust to settle now, be congratulatory etc. Then sit down for a chat about them moving in and lay out your T&Cs.

Can you tell them that it's still fine for them to stay with you for 6 months but they need to be in their own place by the time the baby is born. That gives them 6 months to save/find a rental/get on a social housing list.

That way you don't have to say you're not happy and apprehensive but are firmly acknowledging if they're old enough to have a baby, they're old enough to sort themselves out.

Do they really think it’s okay to live with you as they become parents? Surely not

I think OP means the term time will work well for her daughter when the baby starts school in approx 6 years time but until then isn’t great due to poor maternity pay (how I interpret)

I wouldn't allow them to move in. If you do you will end up being responsible for round the clock babysitting and being a general dogsbody. How selfish of them to think they can stay with you.

Tell them they’ll need to find their own accommodation before the baby arrives.

Well it's not ideal. But can you reframe it as a positive thing, it sounds like your dd has a career (teacher?) and you have the benefit of getting to know your grandchild from a baby, a lot of people don't have that closeness.

It doesn’t sound like you’re not excited about having a grand child, just that you don’t want a baby/toddler living with you. That’s completely understandable. Your DD is an adult and has made the adult decision to become a parent. You can tell her that you are not willing to allow her to live with you when the baby is born. I understand that is difficult and will be hard for them. But they need to come up with a plan for where to live now. They surely can’t have assumed they could live with you indefinitely?

Perhaps time to suggest they look at housing associations and council housing lists. I think you do need to make it clear that you are not thrilled about having a baby in your house full time.

Ah OP, I think this is a perfectly reasonable reaction to the news. No advice but I would feel exactly the same in your shoes. I would set boundaries and expectations from the off as to how much childcare you are expected to do. I’m sure you’ll feel more excited as the pregnancy progresses. Good luck and congratulations!

Are they living with you now? When was the 6 months supposed to run from and to? I would emphasise how much better it'll be for them to have their own place as a family. They can't be planning years with you, surely?

Why will it take her 6 years to get a term time job? Why will she only get Mat Allowance?

I'm sorry that sounds tough!
Would you be in a position to suggest helping them with a deposit for a new place instead of moving in with you?