Help with question

If 1 fully vaccinated no symptoms parent tests positive, the other fully vaccinated parent tests negative no symptoms and children test negative no symptoms, should they quarantine together, or can kids still go to school and d negative test parent do food pickups if they mask and continue to have no symptoms?

Edit: thanks Sarah

Edit: yes, that was my initial thought. Better safe than sorry. My kids go to a private school and the school said so long as they don't show symptoms they can go. But I don't feel comfortable with it, so we'll just all quarantine. Thanks again for your advice.