DS is nearly 10. DD is nearly 7.
DD is totally NT. A typical little minx. But knows her right from wrong. Has a tendency to wind her brother up etc. All totally typical 7 year old behaviour.
DS has social communication difficulties. Very, very intelligent, but has no common sense. Can't ride a bike, doesn't go out to play etc. Very, very sensible, but quite naive. Would never, ever think to do anything wrong, but has a tendency to panic and forget instructions. Has been away to Ireland with cubs and on several school residentials so is quite competent. Doing the 11+ in a few months and hoping to go to grammar school next year (only including to give idea of competency). He will (hopefully) be getting a bus on his own, although up to now he's never even gone anywhere without an adult, and even then, he prefers to hold hands. Mentally about 85 (!!) but emotionally a lot younger, probably about 7-8 years. Your typical, Asperger's mini professor type.
Would you leave them whilst you go to the shop that is a 30 second drive away? Be out of the house 5-10 minutes.