Yeah Ive gotten that far, but imovie/final cut pro dont recognize the video files. Its pretty useless unless I can get that step to work.
The missing piece you're looking for is the Codecs (format) story. The HF200 records in the AVCHD Codec, inside of an MTS/M2T wrapper. AVCHD is a playback format, not an editing format. Thus, you need to convert AVCHD into an editing format that iMovie and FCP understand. I highly recommend VoltaicHD by ShedWorx:
http://www.shedworx.com/voltaichd
Sony Vegas is special in that it is one of the few editing software applications that can natively edit AVCHD. Apple doesn't support AVCHD out of the gate like that, unfortunately (I use an HF200 at work and use Vegas because I can pump out movies faster). You can read more about AVCHD here, if you want a bigger picture of how it all works:
http://www.shedworx.com/node/77
So the bottom line is that you have to convert your HF200 clips into something that Macs understand. It's annoying, but at least you can do it in batches thanks to VoltaicHD. There's a couple things you can do to ease the pain - first, you can use a video library system to import your HF200 clips, and second (if you don't want to use a library system), you can use a Quick Look plugin that lets you watch AVCHD clips without opening a program. Shedworx makes both of these programs. The library system is called Cosmos: (previously called FlamingoHD)
http://www.shedworx.com/flamingohd-features
The Quick Look plugin is called HD Quick Look:
http://shedworx.com/hdquicklook
The one you use depends on how you like to store your files. If you're okay with just dumping files into a folder and managing them in a basic director structure, HD Quick Look is pretty good because you can select the file, hit spacebar, and watch a quick preview of the clip to see if you want to convert it. If you'd prefer to have a centralized location for your movies (think iPhoto, but for HD movie clips), then Cosmos is a pretty good solution.
I haven't found anything as easy to use as the Cosmos/VoltaicHD combo for working with AVCHD clips. I know this sounds like an advertisement for Shedworx products, but I've been using them for a few years with good results and haven't found anything easier for AVCHD file management & conversion. There's some free-er options out there (MPEG Streamclip & such iirc), but if your parents are going to be using it on a regular basis, having an easy solution might be the right answer. So their workflow would go something like this:
1. Plug in the HF200 to the iMac
2. Import clips into Cosmos (aka iPhoto for movie clips)
3. Convert desired clips to work on to Mac-friendly format using VoltaicHD
4. Import clips into iMovie & edit
5. Export to iDVD & burn to DVD
Whew! See how easy editing on a Mac is?

Another option, if they are set on using the OS X platform for editing, is to switch out their camera to something more Apple-friendly. iMovie in particular supports a special format called iFrame, which lets you shoot natively in an iMovie-friendly format. Sanyo makes some iFrame-compatible cameras:
http://us.sanyo.com/Dual-Cameras
Kind of a pain overall. Welcome to video editing! :awe: :thumbsup: