Grand-Sponsor = "Your Sponsor's Sponsor."
Like Grand-father, or Grand-mother -- would be a parents parent.
So... you are your Grand-Sponsor's -- Grand-baby, because you are sponsored by a person that is Spondored by your Grand-Sponsor.
It's good to get to know and form supportive and comfortable relations w/ Grand-Sponsors.
Welcome to the site! Glad you're here and thank you for sharing!