Relax. Take a deep breath.
Don’t be afraid to say at the beginning that your nervous.
Think about some of the likely questions they will ask based on the job - what experience and skills you have that would make you good in the job would be a good question to prep for.
Don’t shy away from talking about excellent time management and flexibility needed to manage 6 kids and cope with the unexpected with a smile on your face while keeping everyone calm and happy.
There will almost certainly be a question about how you work as a team / work with other people so think of examples of doing this that focus on being friendly easy going, cheerful, being quick to help out and work around others as needed to get the job done.
At the end they might ask if you have any questions so think of a couple so it doesn’t throw you on the day - maybe why the vacancy has come up, or what are the rest of the team like or is there anything else that you need from me, have answered everything you needed.
It goes with out saying be super early even if it means walking round outside for a bit, remember to turn off your phone. Look neat and organised and friendly and warm with the interviewers.
Might be worth a snoop on Facebook to se dog you know anyone who works there to ask them about the role / team.
Good luck 🤞🏻