Yes. It is simpler for a family to use the same email on all the accounts you create for younger children. When they are older and doing things independently, you can use the manage account link to change the email setting.

Sometimes — even when you type very carefully — you may not be able to login. This occurs because at some point you typed the user name or password incorrectly and your computer "remembered" the mistake.

This is easily corrected by clearing your browser's cache. If you are using Internet Explorer this is referred to as deleting temporary internet files.