Is it possible to have scabies after 4months, w/multi doses of Ivermectin, to be reinfected/still have it. But not have gave it to husband or 2 sons?

Need details. How many doses??? Standard is 2------TWO. Were your husband and son treated AT THE SAME TIME???? It is necessary to treat everyone in the home, EVERYONE, including those without symptoms. If they were not treated you would be reinfested. Were you treated with permethrum? Are you sure it is scabies? What was the source? If you have not yet seen a dermatologist, now is a good time.