The neighbors who adopt Tyzmon (spoiler)

Tyzman and Mary are a brother and sister pair whom we'll assume find Tyzmon in a basket and adopt him as their 'nephew' and raise him. They apparently try to return him to his rightful family but Macmillan has already done something to his wife/Tyzmon & Icon's mother's memory -- or anyway, that's what the characters believe.

Tyzman is brain-damaged or something and this brings embarrassment to Tyzmon.
Mary 'is usually a bitch' but helps Tyzmon when he brings home his 'Tyzlane Staff'
-r