There are a few problems with the "Do you feel safe in your home?" question. First, I've seen this question asked almost 100% of the time in front of someone else that came with the patient, usually their spouse/domestic partner/boyfriend/girlfriend, etc.--so right there, if there is something going on, you're not going to get an honest answer. This should be asked while the patient is alone, along with questions about sexuality, along with "Is there anything else you should tell me that you don't want me to repeat in front of [support person/family, et al]?"
Secondly, it's a really weird question to ask someone. Most people will automatically say they feel safe in their home, even when they're abused in it. The question should be, "Are you being or do you think you may be harmed physically, mentally, or emotionally?" and then follow-up questions--which is a time to put your chart aside and pay the patient full attention until s/he is done talking. Then chart, and ask questions as you need to fill in the gaps (you may even want to chart this out of sight of the patient.)