Christmas in Milan

We’ll (parents with 2 teens) be landing at Malpensa on Xmas eve in the late PM. I know that Vigilia is a big deal and that many places will be closed, same with Xmas day. I’m hoping for some guidance on 1: where to get some basics for the night and breakfast next day (will Carrefour or local grocery shops be open to grab a bottle of wine and some sustenance); 2: will any restaurants be open for a Xmas eve dinner?; 3: will any places be open on Xmas to grab breakfast/lunch/dinner or alternatively buy something in a store?; 4: I know Milan has a fairly large Chinatown - is it as active on Xmas as those in the US because that may be a good option. Thanks!!