Twin kittens are much easier than twin human beings.
Generally, it is fine. Although the kitty wrestling match on my booty at 1 am is annoying. And funny! I reached over to pull George off my booty and accidentally scared him into the cat-leap-of-fear, which actually woke Dave up and made him giggle.
That is the unexpected and really fun part about the kittens. After having children and seeing them go through their developmental stages, I have come to appreciate much more the developmental firsts for the kittens: attacking toes under the blanket for the first (or 57th) time, chasing in circles the long furry thing that stalks behind them wherever they go, leaping when there is a sudden movement, deciding to wrestle/bite/lick/nap in repeated cycles with each other, and generally being the best TV show we have.
The kittens have been the easiest addition to the family that we've made. Indeed, I'd put the twin kittens on one side and the twin humans as anchors on either side of the Difficulty Scale of Growing the Family.
Yes, even though knitting has taken on new challenges, I am so happy I played my Crazy 8 and got those kittehs. Now if we can just figure out how to keep Bridget from literally loving them to death.