I went back to my maiden name after my divorce and the kids have their father's surname.
I find myself not knowing what to write when asked for the "family" name and often put "Smith/Jones".
What do other people put? I find it especially weird at school because usually when they ask for family name, they are wanting the parent's info but then the kids go there IYKWIM. It's ok at the kids current school because it's small enough for the office ladies to know exactly who I am and what kids I belong to but I'm thinking ahead to high school when there will be lots and lots of people.