and I'll move it there now, but before I do........
Why can't this relative receive your email? There must be some reason, and it will either be your smtp server that's stopping the transfer, or her POP3 server. It's almost certainly her POP3 mailbox that's the problem, and if you're trying to send her "the odd family video" I'm not surprised - most ISPs place limits on big file transfers for obvious reasons - they want to prevent a few people from using an unfair share of the available bandwidth.
You can get special treatment if you pay for it - there are companies who will provide you with facilities for very large file transfers via email, or via download. I suggest that you take a look at
click here which is an excellent company specialising in this service - they even offer a 30 free trial.