I have two boxer puppies, brother & sister, and they are around 11 weeks. I thought it would be a nightmare with some people from here saying they would never sell two pups to anyone, but I have found them so wonderful, and a joy to own. I have found it just as easy training two as it is one, and toileting two instead of one is just as easy. They keep each other amused when I am not able to, they love puppy school and play together and apart.
I've had 5 boxers over the years now, and this is the first time I have had two pups at once. I can say from my experience with these two, I would never buy a single pup again, the amount of trouble I read on here with people who own one puppy that is naughty, toilets inside, play bites too hard, jumps, out of control, etc etc.. It just goes to show you that two doesn't mean twice the trouble or effort.
To answer the OP.. if you needed to get away from your pup by going to your moms, and then you cried for hours.. puppy age isn't for you, and get a more mature dog if you get a second dog. I actually like puppy age.. and have my routines for toilet training, training, feeding etc.. so it's all cool.