Family

This sounds complicated by the fact that both of them were "in the wrong" according to you. Have you spoken to your sister about it or is she oblivious to your situation?

Without knowing more about the fall out it’s impossible to say whether Dd is justified. Would it be reasonable for her to worry about your sister popping in while she was visiting? Are your sister and DD normally the type to abuse alcohol?

Thank you all for your comments, very
Much appreciated

For goodness sake, life is too short to be so petty. I can maybe understand your daughter not visiting at the same as your sister annie1948 but not to stay at all is beyond ridiculous. Are you sure there is nothing else going on you are not aware of.?
If there is no other reason I think you need to have a 'full and frank' conversation with your daughter.

I also think that your Daughter is being ridiculous but all you can do, is talk to her about it.
Of course, you're not going to fall out with your Sister because your Daughter had a disagreement with her but if you can't make her see sense, there's not much that you can do.
Who does your Daughter stay with when she visits then?
Where do you see her? Can you perhaps take the Grandchildren to see her, if it means so much to you?

I meant your sister Annie. Typo.

Heavens above, your daughter needs to grow up. Why on earth should you cut ties with your sister because your daughter says so? This is a problem between them and nothing to do with you at all! She really needs to understand that.

Assume your daughter sees this as a lack of loyalty on your part as by continuing to see her sister you are not supporting her. Not saying that’s right, but If they don’t want to sort things out you are left in an awkward situation. Can you just knock their heads together in a metaphorical sort of way?
I have a friend in a Similar situation with her 2 adult children. It is very sad. Been going on now for 15 years. With no contact between the siblings.
Hope things improve.

I think your daughter is being ridiculous, frankly.
She won't stay in your house because your sister has been in it at some point?!