I am trying to connect via MAC. It says connection timed out.
Try doing it from the WAN interface, since that shouldn't be part of your bridge - although chechito is right in that MAC address should work. When you look in the Neighbors tab of Winbox, you're clicking the MAC and the MAC appears in the "Connect To" blank, right?
I used to have an issue with this type of connection, and I found that removing any IP addresses from my laptop could help when doing MAC-based winbox.... but haven't run into this kind of situation lately so I'm assuming that the glitch got fixed... But it is something to try.
If your computer has an RS232 serial port and you know someone who has access to the blue Cisco console cables, you can use one of those to connect to the console port on a 2011.
Next time, block the kids' devices' MAC addresses in the bridge firewall rules.