I do have a comment however on a previous answer & question:
"Q: Who is/was the father of Arwen?"
"No, the previous question should have read, 'Who was the great, great, great, ... great, great-uncle of Arwen?'"
I think you're both wrong (sorry grondy but I'm going to disagree with you).
Elrond is the father of Arwen. Elrose is brother to Elrond. Elrose is therefore uncle to Arwen. No?
Elrose is also great great... great grandfather to Aragorn so maybe he could also be great great... great uncle in law to Arwen.