Boundries come in time, with a specific purpose intended.
Don't make the mistake of trying to be macho and find any excuse to lay down a boundry.
Find the time for your children. That is the one thing you can never get back....TIME with them.
Look at it this way, if there was something in your life that you really wanted to do, and you made that a priority, there would be no searching to find a way, or the time to do that....
Make them a priority, and the answers will find you....
