This week's writing struggle

Well, I had good intentions to write. The beginning of the week had me running errands in Shanghai. This is a logistical nightmare and took a good deal of time. So when Wednesday rolled around I was chore and kid free. I put the kids on the bus, took a walk with my dog to clear my head and then prepared my work area. I lit a candle, put on some music that I thought was appropriate for the the particular part I wanted to write, made a cup of coffee and sat down to write. Just as I was getting deeply ingrossed, my fingers flying across the key board trying to keep up with the scene unfolding in my head, the phone rings. It is the school. My youngest daughter was sick and needed to be picked up. We ended up in the ER later that evening because of my daughter's wheezing. And then my husband came down with the crud and we had social commitments for the rest of the week. Now it is Saturday morning and I've not done more than a couple of pages this week. I wonder how writers stick to a deadline if they have family commitments?