Thanks for your reply.

Sadly yes, they are just listed on "My family", I wasn't aware up to now of the reduced miles they earn. I contacted Skywards and it is indeed only myself who can use the lounge, so it kind of sucks really!!

One question I do have though, do additional people in "My family" earn tier miles too, even at a reduced rate? I looked at going Business from LHR->BKK and it says I would earn 21000 tier miles for this per Skywards member. I require 25000 to keep silver, so would my mum and dad also earn a few tier miles (i.e. enough to get the additional 4)?

I just wish I registered them on their own accounts from the start, but now it seems silly and if it means that the next journey could retain silver for me, I can always do that for them after.

Thanks.