Would it be wise to put my two indoor cats outside?

About four months ago a neighborhood cat left her kittens on my doorstep and I never had the heart to give them away (I bottle fed them, they basically ume I'm their mom). My kittens, Sara and Gizmo, are approximately five months old. I've had kittens before and put all of them outside but I'm having second thoughts about putting my two babies outside. I have other pets - three other cats and a poodle. The kittens are okay with the cats but react extremely negative towards the poodle. Gizmo will often hiss and spit at Penny (our poodle). Sara runs away, scared. Would it be wise to put my kittens outside? Also, will my kittens ever stop acting like I'm their mom, that kind of worries me? They are extremely needy.