My dad and I have an issue since we play with cards with Ascend. We both play with auras with Enchant Creature. When is an aura under who’s control? I think when he plays an aura on a creature I control, the aura is also under my control. I tried to find the rulings, but I can't find it.
In most cases, the player who controls a permanent is the player who played it. In the situation you describe, if an opponent plays an aura with "Enchant Creature" attached to a creature you control, then your opponent still controls the aura.