Unable to use TCP/IP between Macs over Ethernet

"Well, you have a number of issues in front of you.

Xgrid sharing and Remote Apple Events have nothing to do with this.
You provided a screenshot of your wired interface, but you're using wireless.
The firewall settings likely have no effect on this.
The hex from ifconfig is a netmask

First question, can you get to google. If not, your wireless connection is borked.

Also, are you all in the same physical location?"

You cannot connect to ethernet if you do not have a cable plugged in! Which is why it is failing to connect!