So sorry to hear of the loss of your mum gillybob, I know what you are going through, my dad died last week. I am in the middle of organising the funeral and trying to look after myself too. My stomach has been playing up, feeling sick, running to the toilet, not wanting to eat, not being able to sleep, having emotional bursts of crying and wanting company. I'm only saying in case you feel the same way in the next few days.
I did order on my food order, some easy to eat foods, small packets of ready fruit, soup, eggs, crackers and cheese spread etc., nothing too hard on my stomach and too fussy to make.
It's all the small things that have been keeping me awake etc. Once the funeral has taken place, I can't do it again if I feel I have done something wrong or missed something off. But you can get support off your siblings and work out together what is appropriate and what isn't.
Take care of yourself, PM me if you want anytime, let it out and have a good cry. 