Baby can’t nap while siblings are home

They are old enough to understand they need to be quieter. So you start consequences

I thought you were going to say they were 3 and 4. They are plenty old enough to have consequence's for waking baby. Take screen time from them and stick to it. They will soon learn.

Ban them both from going upstairs when baby is asleep!

They put one foot on the stairs there is a consequence.

So preempt it
Agree with quiet time for everyone
Loo, get slippers, toys and a consequence for breaking it
I found grounded( no playdates, parties, friends round ) got the message across
They are clearly playing you with the grins

They’re old enough to know better. I would have had a firm word last week.

I just reread and see baby is 14 months old. I would be moving them towards one midday nap.

Yes your 8 year old needs to be disciplined for disobeying you. No way should be going into the room where baby is sleeping and yes to toilet beforehand and then there is a ban on going upstairs.

The consequences (usual ones such as loss of treats or screen time) are not really for waking the baby, as that could make them more resentful of the baby. The consequences are for disobeying you when you tell them no shouting, don’t go upstairs, etc.

Gently, you need to crack this now with your child as it will be a long summer. I have a very noisy and active 7 year old and she is very aware that she needs to let her younger brother nap and it is expected she will be quiet in that time. I have resorted sometimes to TV - so nap time is the only time she can watch her special programmes (if I need to do something) or let her pick a fun activity with me that she can't do when he is awake (due to choking hazards etc).

My son was 5.5 when his baby sister was born. At a few months old she was fast asleep in the pram after I had walked her around and around the block and he walked in with his Minion fart gun put it in the pram and turned it on, scared the shit out of her and she woke up screaming. That Minion gun was launched down the garden faster than you could say fart and he was sent to his room. Didn’t do it again and he learnt to be quiet when the baby was sleeping. You need to be tougher on them and teach them some basic rules.

I'd put a stop to the bursting-into-your room thing, unless there is a genuine emergency.

Same with my 3 year old.

They would not behave like this at school.

Buy a potty for the one that constantly needs to go upstairs for the toilet ! I think she wont need to go as often.

My 4 year old is fully capable of being quiet when our baby is sleeping, and understands not shout or crash about near her room. He manages this 90% of the time with gentle reminders. There is no reason your 8 and 10 year olds should not be able to do this! You need to find a way of being firmer with them on this.

Why are an 8 and 10 year old being allowed to behave like this?

I was about to say this.

I had 6 children so the youngest 4 can sleep through an earthquake.

How old is your baby? It seems like your baby needs a very quiet house to sleep in tbh.

They aren't babies and need to learn to be considerate of others. If they wake baby up, no screen time or insert consequence that they will very much dislike.

You have to be extremely firm that every family member serves the best sleep possible. You don’t go in to their room in the middle of the night and wake them for the fun of it and you will not tolerate them doing the like. If need be sit on the stairs whilst the new rules are gotten used to!! Sometimes parenting is holding really firm!!

At those ages I am gobsmacked you’ve allowed it more than once. Poor wee toddler.

OP, I’ve only read your updates and not other suggestions- I would be reading the absolute riot act in your shoes. Mine are 7,6 and 19months. The boys know that they must move around silently whilst baby sleeps and would lose TV / other privileges for deliberate waking. I also set up crafts etc to do quietly during the nap.

You know your own kids.

Therefore you'll know what will hit them the hardest and make them listen to you in future.

Do they get away with running wild and ignoring their school teachers, or smirking at them?

As I was reading this, I assumed your older two were more aged around 3/4. Small children who have no real understanding of the importance of the babies nap, and harder to keep quiet. But when I saw they were 8 and 10, I thought…no. You need to be firmer with them. They are more than old enough to understand basic house rules and need to be told to stay downstairs. Before the baby goes down for her nap, ensure the older two have everything they need downstairs, and make it a firm rule they have to stay in the living room for this time. Consequences if they don’t.

No screen time, no pocket money, early bedtime, no treats - what are your usual consequences for bad behaviour?

Removal of toys, or TV or anything fun! Naughty step If you do it, literally any punishment for disobeying your instruction to be quiet and let their sibling sleep. If these are kids who are normally at school that means they are 4+ and are being utterly selfish. How have you let this go on for the whole 2 week holiday, it's a bit late now to try and implement anything

Edited to say I have just seen they are 8 and 10 years old, I am honestly shocked you have allowed them to disturb their siblings sleep for 2 weeks and not done anything about it. They live in a house with other people and can't have what they want all the time

"They don’t because I am torn between it not being their problem."

They are members of a community and old enough to understand that they don't wake the baby. It absolutely is their problem.