First time poster so I may waffle on, but I’m sat here with no idea what to do?!
Okay, so, i have two DC , aged 3 and 11 and have been a SAHM, wasn’t looking for work but my absolute dream job popped up , I thought I’d apply - never actually thinking I’d be shortlisted for interview let alone be successful !! Here’s the problem..
hours weren’t really discussed at the interview in too much detail. Just that it was 23 hrs per week, and that the shifts can be split over 2 long shifts, or 3 shorter shifts. Tbh I thought the interview went so badly (ridiculously nervous - I’m never usually nervous but because this job means so so much to me, and because I’d been waiting for this position for over a year , I think I was just overwhelmed!)
Anyway. I get the call a couple of hours later and to my absolute amazement I’ve been offered the job - only for the manager to drop the bombshell that shifts start at 7:30am. My DS doesn’t start nursery until 9 and my daughter doesn’t leave for school until 8:15. No breakfast clubs / morning sessions available until September now (I’ve just missed out on this term and there’s waiting lists for the rest!) so the only other option is my mum, who doesn’t drive so I would have to go and pick her up and bring her to mine (to be within bus/walking distance for kids school drop offs) and then leave for work all before 7am - which is absolutely not fair on the kids to be dragging them across town before they’ve even opened their eyes properly!
So... How, or even should I dare to mention to the ward manager that it’s too early for me to start? It would be easier for me as a single parent to get there even 8:15 would be less frantic!
I haven’t signed contracts etc yet, as I’m waiting for all the paperwork to be sorted (dbs checks) etc .. this is my dream job and I don’t want to mess it all up before I’ve even got there! But I really am worrying that I will just constantly be late/rushed and as it’s in a neonatal care ward it’s important for my to be calm and professional and on time 
Will I risk my job!? Will she retract the offer? Aaaaaahhhh!!