Sorry I've been absent for a while. I got sick, then was so tired I could hardly stay awake when I turned on the computer. I'm better now.
I have never tried the '3 sister' companion. I do know that marigolds grow well with nearly anything. Morning glories and pole beans do ok together, basil and tomatoes do well together. Eggplant and mint seem to make good companions.
GOD bless and keep each of you.
EvaMae