willpax, if you're willing to play your first concept, then I think our backstories could weave together nicely.
Julian Fairhair had only one blessing in his life; his ability to produce stirring, angelic, and lyrical song with his voice. He and his twin brother were the youngest of seven siblings, who lived with their father and mother deep in an urban slum. A few years before their birth, their father had lost a successful exchange business. Their were only four Fairhair children at that time. The cost of raising a family (a family that gained three more mouths in three short years) brought the moderately wealthy Fairhair family down into the streets. When Julian had reached seven years of age, the elder Fairhair and his wife decided the best chance for their family was to sell off the youngest five children into servitude. Julian was sold to a wealthy noble family, where he became a waiting boy to the mistress of the house and a regular source of entertainment. Julian's singing enchanted the noble family so much that, on his ninth birthday, they had him castrated to preserve his angelic voice.
Julian was well-treated in the noble household, but he yearned for a different life. The other servants would often catch Julian in the master's study, pouring over tomes containing great tales of valor and epic adventure. Julian longed to travel the world and witness the kind of adventures he read about, desiring to tell their tales as did the bards who penned the volumes. Though he probably didn't realize it, deep down he wanted to be a part of a great adventure himself.
This is where you come in, willpax. If you go with your first concept, then we could easily say that the noble house you seek to avenge is the same that kept a teenage waiting boy with a voice of gold. We'd probably know of each other, even if the son of a nobleman such as your character didn't associate with the "help".