Sounds like you're doing pretty good Daren. When your life is as full as it is, it becomes ever more important to have a solid plan for achieving your piano goals (or any goals for that matter).
Maybe once 10:30pm comes around, and you can't practice 'cause everybody is asleep, or perhaps it's 3am and you are taking your "lunch break" - use these minutes to setup your practice log for the next few practice sessions. Determine *exactly* what goals you need to achieve in the short term, be it a bar, a phrase, a page, a certain physical technique. Plan realistic goals that can be achieved in as little as 10-15 minutes at a time, that add up to your end-goal. With such time constraints, without a plan, you are likely to fail.
PrincesClara2005 had some good points:
i think with limited time, when you do manage to sit down, you just have to pay extra attention, and be as productive as possible
make a 6 month plan with 1-2 pieces in mind to work with time frame.
She is exactly right - be as productive as possible when you do get to sit down - and to do that, as she said, make a 6 month plan, and then break that 6 month plan into single months, and weeks, and days. Use time you can grab, when you don't have access to the piano, to make these plans. Re-evaluate the plan frequently to stay on target and remember, lots of very specific goals, each of which you know you can accomplish in 15-30 minutes. There is no need for you to "find" a block of 1 or 2 hours in which to practice. If you have a series of pre-planned goals, you can grab 15 minutes here, 20 minutes there, 10 minutes again etc., and if you organized your small goals so that they add up, you will be successful.
In fact, you may find that this approach works even better for you than if you were to have a single 2 hour block available to you every day. I personally find that the more "I have on my plate" the more I excel at every one of them. When things get relaxed and I don't have to be disciplined about planning all of my endeavors, I tend not to make any progress. What's that saying "Idle hands are the tools of the devil" or something like that
Finally - I just posted this the other day on pianoforum as a sorta moral booster to somebody with a similar situation. Take it for what it's worth (I did not write this)
A professor stood before his philosophy class and had some items in front of him. When the class began, wordlessly, he picked up a very large and empty mayonnaise jar and proceeded to fill it with golf balls. He then asked the students if the jar was full. They agreed that it was. So the professor then picked up a box of pebbles and poured them into the jar. He shook the jar lightly. The pebbles rolled into the open areas between the golf balls. He then asked the students again if the jar was full. They agreed it was. The professor next picked up a box of sand and poured it into the jar. Of course, the sand filled up everything else. He asked once more if the jar was full. The students responded with an unanimous "yes." The professor then produced two cans of beer from under the table and poured the entire contents into the jar, effectively filling the empty Space between the sand.
The students laughed.
"Now," said the professor, as the laughter subsided, "I want you to recognize that this jar represents your life. The golf balls are the important things -your family, your children, your health, your friends, your favourite passions-things that if everything else was lost and only they remained, your life would still be full. The pebbles are the other things that matter like your job, your house, your car. The sand is everything else-the small stuff. If you put the sand into the jar first," he continued, "there is no room for the pebbles or the golf balls. The same goes for life. If you spend all your time and energy on the small stuff, you will never have room for the things that are important to you. Pay attention to the things that are critical to your happiness. Play with your children. Take time to get medical check-ups. Take your partner out to dinner. Play another 18. There will always be time to clean the house, and fix the disposal. Take care of the golf balls first, the things that really matter. Set your priorities. The rest is just sand." One of the students raised her hand and inquired what the beer represented.
The professor smiled. "I'm glad you asked. It just goes to show you that no matter how full your life may seem, there's always room for a couple of beers...!!"