Yeah. It is completely nuts.
It does not mean twice the training, twice the socialization, it's more like three times. Because you need to train them separately. And you have to train them together. And training them together will take way longer than training a single dog. For example, house training: you jump out of bed at the crack of dawn throw on your muckalucks and pull the puppy out of the crate, and stand outside for half an hour in your PJs pleading with your puppy to potty while you are becoming increasingly frustrated and cold, knowing all the time that the other little monster is probably baptizing her crate right now.
If you have one puppy, then when you call the puppy out of the yard, you're pretty darn exciting and the puppy will want to come to you for whatever you want to do next. If you have two puppies, and they are horsing around in the yard, they may not think you are quite as exciting as they are while they are engaged in some nuisance behavior or another.
All the socialization done with a doggy-buddy needs to be repeated while the pup is on its own with you. Pups get their confidence from the litter. So a trip to the vet's waiting room with their litter-sister is a whole different ball game than being there all by her doggy self. Dog classes need to be separate.
But that is not all. After spending 10-24 months training and socializing and bonding with your two puppies, they might decide one day that they no longer are willing to tolerate the other. And you are in the same boat you are right now. Remember that bitches will start fighting for a number of reasons: they are close in power; one or both have resource guarding problem or the green gene; they are reaching sexual maturity; one rubs the other the wrong way; a great play session goes overboard.
Lastly, two puppies are cute. Two young dogs are a lot of work. You've doubled the food and vet bills and tripled the training, and time and working and grooming and everything, and now your dogs are 7 or 8 or 9 and pretty darn close to perfect. And suddenly you are dealing with two geriatric dogs. Or, one of your dogs get's something awful and dies. And the other dog follows soon after. That is double the grief.
I have littermates. I have raised litter mates 4 times, besides the pups I have right now. I am set up so that I can keep them separated when I am not there or always if necessary. It can be done. But you really have to go into it with your eyes open.
These puppies are too young for you to know if you will or will not have a problem with SSA.
Jenna, RN CGC & Babs, CD RA CGC HIC
Heidi, RA CGC
SG3 Odessa, SchH1, Kkl1, AD
Ninja, RN CGC & Milla, RN CGC
Joy, Star Puppy, RN CGC
Dolly CGC & Bear CGC