Badly behaved grandchildren - what to do!

Just an add on to this. I had children and worked nights as a nurse my husband worked days, parents were a long way away, however another nurse and I shared care of our children, sometimes in the same house, us lying on the settees, and kids playing happily, Obviously this was back in the 70s when we just had to manage, no expectations of anyone stepping in. Both of us were of the mind, we had the children and they were our responsibility. We decided to work as we needed money to pay the mortgage, have a carpet and perhaps a fridge. Our children were our responsibility no one elses. Am I being tough

Give them choices... Ie, if you want to scream around the shop we'll go home so the choice is inside voices or go home....
Choices work with my grandchildren

It sounds as if you're doing the looking-after, icandoit, although you say, we look after.
Would Grandpa be available to take one of them out for part of the day?
I was on WhatsApp only today with younger GS, 19 and studying to be an engineer like my late DH. He said that some of the happiest times in his childhood was "working" with his GF.

I used to look after 2 of my GC at the same age. I collected them from their house.
I would plan a day ahead with interesting stuff for them to do but occasionally they would start pushing and shoving each other and be very loud about it. I live in an apartment and explained they had to quieten down and consider my neighbours. They understood and agreed but soon they relapsed so I said, "If you don't stop I will take you home and in future you won't be able to come here together". All good until the next time they came! I reminded them of what I'd said previously but they started "fighting" so I said, "OK guys get your shoes on I'm taking you home" and back we went. I had them individually for a while and later together again and they'd got the message and were great.Their parents are on the same page fortunately.

They are badly brought up by their parents. Nothing you can do. So do not be a doormat. Only one day here and there would be more enjoyable for everyone.

Cambsnan

I was having issues with my grandchildren and asked them how I could be a better granny! Eye opener. I acted on what they said and things are better.

This is really good advice.