Being pulled in every direction

In the course of 24 hours, the following were said to me this week:

1. "You spend all your time with Colin." --- from my 13-year-old, Katie.

2. "I hope Katie doesn't make the play because I never see you." -- from 11-year-old Colin.

3. "Is everything OK? It seems like you're not paying attention to me." -- from Hubby, just a few years older than me. :)

How the heck can they all think I'm focussing on someone else? What must I do to have them all feel loved and appreciative of my efforts to "be there" for all of them? Some ideas: 

1. I carry around a stopwatch and they see me set a timer, which tracks our time together. Each of the three get the same amount of time.

2. I create a chart tracking how much time I've spent listening to them each, helping with something or other, or enjoying time together.

3. I rent an inexpensive, nice, oceanfront hotel room for the remainder of the winter and then they can truly feel how much I am there for them.

I'm kidding...sort of. This isn't a half-bad list, but I'm open to other suggestions. What say you -- equally giving, pulled-in-every-direction mom?! Any ideas?