Ciel has Doll as a sister, Undertaker as an uncle, Alice as his betrothed, and Urahara as a personal manservant.

Kotarou has Negi and Killua as his brothers so far.

Alphonse is the illegitimate child of Yuca and Break before Yuca gaymarried Horst. He's betrothed to Negi. Because.

Who are they related to by proxy? AND STILL TAKING MORE.