Well I don’t know anything about your SIL. I myself am the type who will thinking of calling someone, then procrastinate in it indefinitely. I’ve been meaning to call my in-laws for the past two weeks, but it kept getting pre-empted by something else. I’ve also procrastinated calling my bro for a couple of months now. My problem is that when I remember, I’m usually not in a position to do it. When I am in a position to do it, it keeps slipping my mind. Do you think it could be the same thing?