RLNT, 263 words, rated K, no spoilers for anything, unless JKR gifts us with at least 10 more books after the next one and I can See the future. crosses fingers
"Mummy?"
"Hmm?"
"Why do the Wheezies call you Tonks?"
"The Weasleys call me Tonks because that was my name when they first met me. I wasn't married to Daddy, so I still had the same name as Grammy."
"You're not married to Daddy when you see the Weasellys!"
"No, no, I'm always married to Daddy. See, I'm still wearing the ring."
"Oh, okay."
"It's a little confusing, isn't it?"
"Uh huh."
"Well, let's try this. What is my name now?"
"Mummy!"
"What's my name when Grammy Tonks comes over?"
"Niffdora?"
"Close enough. And what does Daddy call me when I get home from work?"
"Love!"
"Yes! See, all those names mean the same thing; all three of you use a different word, but you all mean me. Does that make sense?"
"I guess so… It's kinda like when I call the see-saw a see-saw and Vikram says nuh-uh it's a teeter-totter but it's still the same thing. Right?"
"You've got it! That's exactly what it's like."
"Okay."
"Any more questions?"
"What was Daddy's name when he wasn't married to you?"
"Well, boys have it easy. They have the same name when they're married and when they're not."
"He was Daddy then, too?"
"No, no, I meant his name was still Remus. He only got the name Daddy when you came along."
"Does he have any other names?"
"Uncle Sirius used to call him Moony, because of his illness."
"Oh. I like Moony. It's silly."
"It is silly, isn't it?"
"Uh huh. Mummy, what do you call yourself?"
"I call myself Lucky. Very Lucky."