Our twins are 7 months old. We currently do not know any other families with twins, just singletons. Sometimes it's just too hard to explain what twins has done to our family of three, which is now five! It's great but we are all sleep deprived at the moment.
I can totally relate. We went from 3 to 5 as well. My twin boys are 8 1/2 months old and my older is 2 1/2. Like I said in my earlier post, it took quite some time but I was finally able to get into a routine. They all go down at the same time for an afternoon nap so if I need it I can take one as well. I would suggest if you are able, to do the same. It really helps! And I just it a day at a time...all you can do.