dzuls said:
if abroad, do the letters of support have to be notarized or can I just write the letters myself and give it to my family to sign?
If you are applying as common-law or conjugal, then two letters have to be notarized or affidavits. If you are applying as married, then these letters are just extra evidence. They could be printed-out emails, letters, notarized letters or affidavits. It is up to the visa officer how much weight he or she will put on them.
Personally, I would not write the letters myself. It is better to get people to write their own. If it looks like you wrote them all yourself, the visa officer is unlikely to pay much attention to them. If you have a lot of other evidence, it probably won't matter. If you really need them because you don't have much other evidence, I'd get authentic letters, even if that means you have to get them translated.
Fencesitter had a lot of evidence, so there was no reason for the visa officer to question the letters. But if you have a marginal case, in particular if it goes to appeal, it will look bad to have letters that appear could not have been written by the people who signed them (for example, if a person who can't understand or speak English has signed a letter written in English.) If you explained or translated the contents fof the letter, and the person then signed, it will probably be OK, but it is not ideal.