Hi Claudia:

My common sense tells me that if the accent(s) do not appear on any official document (issued in the U.S., I assume) such as the birth certificate, passport or other, then DO NOT use any accents, despite the fact that the parents´official documents may bear the accents.

The person should they have/want to amend in keeping with his parents´official documents will have to go through the appropriate authorities seeking an amendment.

That is my advice.

Saludos.

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Note added at 19 mins (2008-06-19 04:27:42 GMT) Post-grading
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I am not disagreeing with cserranoh´s answer. Where I disagree is the rationale. My name is a case in point and is spelt with an ñ not with merely an "n". A name is a name, i.e. René bears an accent and is quite common in English-speaking countries.

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Note added at 21 mins (2008-06-19 04:29:54 GMT) Post-grading
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Thanks Claudia. Muy amable. My name on my birth certificate appears with an ñ, not just "n". Good luck.

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Note added at 34 mins (2008-06-19 04:42:54 GMT) Post-grading
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@ eloso:
Café is a different story:
See: http://en.wiktionary.org/wiki/café
EtymologyItalian caffè < Turkish kahve < Classical Arabic قهوة (qáhwah, coffee).
Main Entry: ca·fé
Variant(s): also ca·fe \ka-ˈfā, kə-\
Function: noun
Usage: often attributive
Etymology: French café coffee, café, from Turkish kahve — more at coffee
Date: 1802

French: bears the accent: café.