I know, right? Of all the months they want to do a daily prompt challenge! Plus you probably can't put your sister off. Family always have a way of turning things back on you when you're the one to say it's not a convenient time for you, even though it's okay when something doesn't work for them.
I stopped keeping an official list, but I have started comments in my inbox for ideas / suggestions plus another mental list in my head. A physical list would just be too depressing! Bad enough my temporary writing file has about eighty pages of snippets for things I've started and never finished.
Best of luck for the week ahead, it's probably the only time I'll have to chat along the way until it's all over! ;)