Hey there Tina ... In the past, I have bought 'yearling' siblings where one was much larger then the other. I would have appreciated at least a mention of the size difference as well. As for buying 'online' I have done that 99% of the time and it has worked out well ... I think perhaps asking/posing alot of questions beforehand may prevent future disappoinment. If the seller is annoyed by questions I would move on ...

best wishes