My ds is 5 and in school he's been learning to write his first an last name. Well he asked me what daddy's last name was and his sisters and then he asked what mommys last name was. Well since my bf (who's the kids BD) all have his last name and I have my last name. Obviously we're not married so I have a different last name then my kids. So what should I tell him? I don't want him to feel differently because he doesn't have the same last name as mommy and I don't think he would understand just yet.