Agree with SwissRef's strategy. Going to Orlando via Detroit likely means you are on Delta/Northwest. This airline has about 6 nonstop flights per day between those points (and many more that would connect through Atlanta). While you would probably make the 1:25 connection, consider the consequences if you do not. Biggest concern would be the loads on the later flights if you missed your booked connection -- especially if it is close to Easter and have 7 passengers to be reaccommodated.
Note, too, that if your family is like mine, there is always someone who needs to stop at the restroom or look in at a gift shop when traversing an airline terminal. Unless you are very vicious in herding them, they will not move as fast as a single person might in running between flights.
Now if you are connecting in Detroit to a different airline (e.g., AirTran or Spirit) for your flight to Orlando, be much more cautious about any close connection. They have fewer frequencies, and if you are not booked on a single ticket, you might not be reaccommodated at all.