Basic parent/child concept clarification?

I only really know basics of HTML, but what is the parent and what is the child in the following?
<p class="a">This is paragraph 1</p>
<p class="a">This is paragraph 2</p>
<p class="a">This is paragraph 3</p>
<p class="a">This is paragraph 4</p>
I think the <p> tag is the parent, but is the child...   class, the text or both?
Also, is a class considered a parent and "a" considered a child? Or does parent/child only deal with elements?

Hi
In the example you give the <body> element would be the parent of the <p> elements.
see - http://books.google.co.uk/books?id=rdtCRLXAL78C&pg=PA44&lpg=PA44&dq=css+parent+child+relat ionships&source=bl&ots=mS_Pmf_c_t&sig=XEhGVImZlsitIEnB-o4OgLBxSIA&hl=en&ei=TxL9TIqMD825hAe Sh9n1Cg&sa=X&oi=book_result&ct=result&resnum=7&ved=0CEsQ6AEwBg#v=onepage&q&f=false.
PZ
www.pziecina.com

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