If you want to help your sister, the best thing you can do is find the best broker you can in San Francisco unless you are very familiar with this market. There are lots of disclosures here that don't exist elsewhere, and there are accepted ways of doing things that vary with other areas. If you are unfamiliar with the market it will also be more difficult to get offers accepted - no disrespect intended, it's just the way it is here.
This way you are really looking out for her and get paid for your time with a referral fee. If you'd like to discuss it our contact info is below:
Lance King/Owner-Managing Broker
As recommended, establish a relationship with local representation through a referral. Your sister gets the best service and the referral fee accrues back to you. Other than the need to park an RV, any other criteria to follow? What price range are you working with?
415 828 4063