Thanks to all who answered. This was the information I needed.
Sitting with another group is OK but we will have a 'challenged' person with us and it might be better to have just family sitting at the table.
The other issue, waiting on a group that might delay ordering, gave me concern. I did not wish to have our servers or the service in general, delayed if plans for shows had been made. (this was a discussion on another posting) I was not sure that the servers would take one group's menu orders without the other group being at table.