Can I use RAF like this?

Q u o t e:
Account #1: My main
Account #2: RAF invite from account #1
Account #3: RAF invite from account #1 or account #2?

Yes, you can do this.

Q u o t e:
Basically, I would like to use my lvl 70 from account #1 to group with new characters from #2 and #3 and have those two share the triple EXP bonus. If I want to do this, should I send the RAF invite to account #3 from my main account or my first RAF account? Does it matter?

It depends, Nve. If you want all three to level together all the time, then you can have your main account RAF account #2 and account #2 RAF account #3. If you think you may only want to play two characters at once, then having your main account RAF both of the new accounts would give you the option to JUST play your main and one of the lower level characters. :0)

Q u o t e:
Alright thank you Auryk. I plan on having all 3 online at the same time, basically having my lvl 70 from the main account guide the two new characters through quests/dungeons.

So I would have to make #1 invite #2, and then #2 invite #3 for the group bonus to apply. Right?

Either one would work, Nve, as long as the other guidelines are met. If you have the main account invite the two new accounts, then as long as a character from the main account is present they should both receive the bonus – though there are some other ramifications such as level differences.

You would also be able to gain the bonus experience if you had your main account invite account #2 and #2 invite account #3 – as long as the main account and account #3 are not the only ones in the group.