Q: User Accounts Question

No they won't.

This might come in handy also >   OS X El Capitan: Set up parental controls

Frank1991 wrote:

 

Will my kids be able to view my calendar events or photos from their user account if my account is secured with a password?

No, as the administrator you will be able to manage privileges and parental controls.

see > OS X El Capitan: Set up users on your Mac

Your account should not be accessible to other users. You can also share out certain things if needed.

You can share calendars via iCloud, and you can also set up Family Sharing in iCloud and have a Family calendar that you can all access.

Calendar (El Capitan): Ways to share calendars

Family Sharing - Apple Support

You can also use iCloud Photo Sharing to share Albums with other people via iCloud.

iCloud: Set up iCloud Photo Sharing