Canonically Tracy is Iko and Nights son but for the College universe series he's not related to them because they don't exists in that universe! That being Tracy doesn't talk about or involve his family in anything. He prefers to avoid the subject at all costs. Some people speculate his family life was turbulent because of his jumpy and nervous personality.
Tracy was born intersex but just tried his best to hide the fact. His voice is rather high and gentle similar to Alphonse (full metal alchemist).