I use the simple HTML export option to create a website that I can access from my BlackBerry. BlackBerry and most other portable devices are not able to open WebBrain sites.
A thought html-page created in this way, displays not only parent, child and jump thoughts, but also all thought's siblings, which creates in my case a very large overhead that consumes a lot of storage on the web server and makes html pages very large, slow to load and difficult to read on my BlackBerry. I use a brain for collecting information on classical music and my classical music collection and I have created thoughts with many (multiple hundreds) child thoughts (for instance a thought 'composers' with many composer child thoughts, a 'Bach' thought with nearly 1.000 composition thoughts). This means that when I look at a composer of composition, all other composers c.q. composer compositions are loaded into the html page.
In PB you have a preference to enable/disable 'Show siblings'. I would appreciate is this option could also be available in the Simple HTLM export options.