This may be bad, but I have told a few people simply, "I do not have a family", when they have asked about my family. I know it kind of implies they are all dead. Hopefully God will not see this as a sin but I really do not have a family in the way that it counts. It is easier to tell people this rather then get into long explanations about how my mother is a sociopath and turned every member against me. Some church members I told them I am estranged due to religious differences.
It is easier for me to just let people think that my family is all deceased. That can happen if someone is old enough and if there were no siblings, and people age and die. When one is without a family, they realize how family is such an important part of people's lives, where even the unmarried and childless who are aged, will still have nieces, nephews, aunts and uncles and parents who still go to dinners with them and visit them. One friend told me, "You really never had a family." and they are correct.