Hi,

You can create new returns from the Return Manager using the same account. 

https://turbotax.community.intuit.ca/replies/3288128

Thanks for the reply.  When I start a new return as described, will it delete the return with my wife and my own info?

No, it will just create a new "file" in the Return Manager. I've edited my answer above to show a screenshot of how the Return Manager will look like with additional files.

If you're concerned about your and your wife's return, you can also create a separate account specifically for your kids. But it's easier to manage everything in one account (username, password...).

Awesome! Thanks for the quick help.