“Where I can enter my parent's house without exposing them?”

First, always wear a mask and keep at least 6-12 feet away. It would be best, if weather permits, to meet outside and still wear a mask and keep at least 6 feet distant. If you choose to meet inside, any entrance should be okay. It's what you do that is risky, like not hugging, kissing, shaking hands, and distancing and mask wearing when visiting them.

If you are infected with covid-19, do not go until fully recovered. If you are not infected but were exposed, do not go until 14 days after your exposure. If no infection or exposure, then wash hands before going and or use alcohol rub before entering, keep your social distancing from them in the house and wear your surgical mask - no need for them to wear theirs, assuming they have been isolated. Obviously, it may be difficult to socially distance, but do the best you can and watch the news as guidelines may change or may be more specific in the future.

G. Dickinson