Me, DH and 3 kids under 10.
We always have in: porridge, weetabix, shredded wheat and shreddies.
Other things we might have one or two of at any one time: cheerios, cornflakes, rice crispies, blueberry wheats, fruit and fibre.
We switch between branded and own brands of all of the above depending on whats on offer.
Sorry, probably not very inspirational. I rarely eat breakfast but when I do it'll more likely be a bacon omelette if I have time to make it.