Many of the X-Men are orphans. Most famously is Cyclops, whose parents were seemingly killed in a fiery explosion of their private aircraft. Of course, many years later his father was reintroduced as Cosair, and even after he died again by Vulcan's hand(another reintroduced family member), he seems to have been revived yet again.
That said, young Scott was raised in an orphanage(to be experimented upon by Mr. Sinister), while young Alex was adopted. While this thread could be a place for all of the various orphaned mutants to get some light shined upon their tragic backstories, I am particularly interested in Alex.
Have we met his adopted family? Have there been stories with them?
Are there other mutants whose family histories remain a mystery?
Did Xavier intentionally target orphans to bring into his fold, knowing they had no where else to go?