My twins are 22 months, and they are really hard work right now.
For the first time ever, today I found myself wondering why we'd gone through all the cycles of ivf

They fight and whinge at each other all the time, oh, apart from when they're plotting mischief together!
Today DTD had 2 time outs for squeezing the cat till he cried,and one for pulling her brother's hair till he cried. DTS had a time out for throwing food, and one for squeezing the cat as well (poor cat, he's 19 and very gentle with them, but they just won't learn to stroke not squeeze). The timeout upset DTS so much he then refused to eat his lunch.
They were both exhausted so they had a really long nap this afternoon, which means they didn't go to sleep until almost 9pm tonight (they went to bed at 7).
How did mums of older twins get through this phase? I do know it's only a phase, but it's sooo hard! I keep losing my temper and really shouting at them, then feeling guilty for shouting.