"I know that I have a son!" she snapped, only realising a moment later that while she knew his first and middle names were indeed James Sirius, his, and by extension her, last name was just sort of hanging out there like it was on the tip of her tongue, in the back corner of her mind and it just wouldn't come to her.
"I know who James Potter was, and I remember Sirius Black." Ginny said, refusing to admit to this man that she wasn't so confident in all of her previous statements now. It worried her that she couldn't remember her married last name, or her sons but she wasn't going to show it to a stranger. For all of his claims that he was her husband, he could just as easily have been lying.