Prioritize your time and schedule a healthy balance of activities the whole family can live with. Communicate schedule changes, and stay flexible enough to take advantage of some of those unexpected opportunities and challenges. Post a big home-made chart, buy one, or use the computer screen. However you do it, make sure everyone puts important events in one place. Instead of rehashing gripes in the heat of the moment, schedule a family meeting to handle tough conflicts.
Every person gets a say, and listening leads to better feelings for all.
Good for prevention, too. Make sure everyone gets some personal time and personal space. Even a half hour of your own is better than none. No interruptions allowed. Plan for something relaxing to do together each day, not just television.