My two youngest kids claim to be Athiests

Last night We asked our 13 year old son to take the hose off of the tap just outside the house below my bedroom window! He was struggling with it so he got a wrench to which he still struggled with it as it was cold and dark outside. So I prayed for him that God would give him supernatural strength and then just like that he removed the hose from the tap! I then told him that I prayed for him about it and he told his sister that he received supernatural strength when I prayed for him! I overheard him and thanked God for blessing my children who claim to be atheist but see the workings of God!