Not Blood but Heart

(WBWL)"It is not flesh and blood but the heart which makes us fathers and sons."-Johann Schiller. The wizard world thinks Sirius Black is after Julian Potter to finish the job He-Who-Must-Not-Be-Named started, but in reality a battered godfather reunites with a neglected son, and another tries to protect his godson from his father. A not-quite multiXover, explanation inside.