Determine if this repair is needed to maintain habitability of the home. If the repair is necessary, ask the family to move the person(s) with COVID-19 into one room or area of the dwelling and have the rest of the family disinfect the home. The repair person should wear coverings that would prevent the spread and proceed with making the repair being mindful to wipe off everything before touching it and after touching it. Remember to wash your hands before and after beginning the work and disinfect after exiting the home.
You may consider permitting the tenant to make the repair him/herself if it is a small repair or does not impact the habitability of the home.
You may consider permitting the tenant to contract with a licensed professional and reimbursing them for materials or the contractor needed to make the repair.