I think your first step is to take everyone to the doctor, you, your dog & your family members. Have a very thorough discussion with your doctors about the allergies and also have everyone get all new thorough allergy tests done.
The second step depends on the results on the first step.
I am sure once you know exactly what everyone is allergic to you will have no problem solving it. There are many many options out there for all allergies, dogs & humans alike.