A real newsreader, such as Outlook or Pan ( not Google ), has an icon ( or key-stroke ) that takes you to the parent post; hit it 4 times, and you're at the great, great grandparent.
FYI, this is the immediate subthread, most recent first, going up the root:
Hatunen news: snipped-for-privacy@4ax.com Robert_Baer news: snipped-for-privacy@corp.supernews.com Jeff?Relf news:Jeff_Relf_2008_Jan_3__9_40 snipped-for-privacy@Cotse.NET hanson news:cP9fj.16926$DG4.14941@trnddc04 Ian_Parker news: snipped-for-privacy@21g2000hsj.googlegroups.com Tom_Potter news:477cd7d7$0$27923$ snipped-for-privacy@free.teranews.com