IMO mothers of twins should be treated like patron saints until the children are 6. LOL! Ahh... grandparents. So much fun. They really don't remember. I love my in laws, but they NEVER listen to me that my kids need to eat early. They feed them too late, keep them up too late and wonder why it always ends with something getting thrown etc... I keep telling them food -serve food between 5-6:30 (done by seven), bed between 7:30 - 8. But nope. They really don't remember what children need. Now I tend to dump them on the grandparents and let them do their thing. When I get the story in the morning, I'm like - "told you so..." and around it goes.
I remember the witching hour! My kids were pretty good but even then the FUSSING. My younger was a biter. If we kept her out, she'd inevitably sink her teeth in another kid. It was like having a gremlin. But she was always right as rain the next day. My other can be great staying up and would never just sleep on the sofa while we chatted (as some kids do), but oh boy, we would pay for that one night out for DAYS.