Josey is alone for more than 8 hours during the week, granted she has the company of my sun conure and cockatiel but I leave the radio on while I am gone to have some background noise, they are fine, they have toys to occupy their mind and they are glad when I return and let them out.
I too think since you have young children you would be better off going with a just weaned baby grey, you will still have to keep them at a distance until they learn how to behave around parrots but they could grow up with the bird so to speak.