How to record if and when my Macbook is opened I like to know when my family goes on my Macbook for numerous reasons. Is there a way to record when or if people go on my Macbook when I leave it laying around?
Try the command last

It will show you every login since the last reboot.

Open Terminal and just type (using my dev xserve as an example)

[admin@xserve1 ~]$ last
admin      pts/0    allans-imac.home       Wed Mar  2 23:20   still logged in

utx.log begins Wed Mar  2 23:20:07 EST 2016
[admin@xserve1 ~]$ 


This would be correct since nobody but me (the admin) had logged into it.