Hi, how come I can't invite a few people to tree?

I had once invited one of my brothers to the tree long ago but he never accepted or anything....but where can I re-invite him?  It doesn't even suggest that he never accepted it. 


The harder one is my other brother.  It doesn't allow me to enter in his e-mail address from the tree screen like it does for others...why is this?  How can I invite him?  I go to edit profile but nowhere does it allow me to enter in his email address, and it's pretty frustrating.  Thanks. 


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