What happens if my w2 doesn't get filed today?

So I'm disabled. I cannot do my own taxes, my mom has been doing them for the last 30 years but she passed away from cancer. My sister said she was going to be doing them yesterday but didn't, and now today shes claiming shes been busy all day and I'm worried they aren't going to get done at all.

She said "my husband hasn't paid off his taxes in the last 3 years nothings going to happen to you" I'm just unsure what to do in this situation. Shes suppose to be my caretaker and it feels like shes not taking it very seriously.