@Durin,
1) Is it a relatively accurate summation?
To pilot a Titan, one should have extra strong will and durable brain, to pilot a Knight psychic and biologic requirements are somehow less high, but there also protection from non-authorized access programmed in Knights, which prevents people not from a Knight House(or more probably the Knight House which Knight belongs to) from piloting. Can a Knight pilot a Knight of a different House?
2) If Fred fulfills first requirement, can we create a Knight that recognizes him as a Knight?
3) Or I should stop trying to make up in-universe excuses and accept that he shouldn't become a Knight for metagame reasons?
We don't have necromancy yet. IIRC her biological parents died some time before. She probably has expanded family though.