Melanie,
Your response to the info I found made my day - and it is still only about seven in the morning! I got a "buzz" from finding it myself.
...I live in Glasgow, Scotland and I find that Scotland People is a great site for finding out about Scottish ancestry. There is no Membership fee that I have ever noticed. You use credits instead, and can often see a photo of a birth, marriage or death certificate etc for about seven credits altogether, which is less than you normally pay. And you can see it right away on screen, if you are pretty sure you have the correct person. It can become addictive though. Often, you see a lot of people on a list, and aren't sure that the one you open will be right. That's when the cost can mount up - but for sheer speed of seeing a certificate, it's terrific. You have probably used it yourself...
Find My Past is good for outgoing ships records from the UK from 1890 to 1960. Instead of naming the country you think a person went to, you can if you want just leave that part blank, and in your case it would give you results for all folk named TOUGH voyaging to anywhere, including Canada or USA.
Can you tell me if George Tough married yet again?
I noticed a George Tough who was married to Christina, returning to Scotland in 1956. But he was an Electrical Engineer and I have dismissed him as being simply another George Tough with nothing to do with your ancestors.
I also think the real George may be on "Border Crossings" (from Canada to USA and vice versa) I have seen a George Tough there. However, there was probably more than one George Tough, although I don't know that for certain.