youth deer hunting question

Does anyone know if there is a legal age at which a child can deer hunt alone in Mississippi? I have been told 12 but I can't find anything official searching regs on the internet. I have 3 boys under the age of 12.5. Its hard to get them all in the woods at the same time. This year I have been walking my 12 year old to he stand and climbing up with him, loading the gun and placing it down next to him. I also don't allow him to climb down from the stand. I go back to his stand, climb up and unload gun and assist him getting down. Occasionally I put my 11 year old in the stand with him. He is not allowed to shoot. Just watch. This is especially helpful on morning hunts when I think my 12 year old may be a little too spooked to sit in the stand by himself in the dark. Collectively they have jut enough courage. Is this legal?