Use your role model of commitment to encourage others to want to change. Do not punish yourself for any guilt you may feel for the troubled behavior in your home. You are not solely responsible for the others' behavior. If the problems become unworkable, seek out professional help for your stressful home life. No one can plan in advance how to feel when crisis or unexpected events come up.
Flexibility is the name of the game, but it is hard to develop.
Seek support from your social support sources. Seek out professional help if you find the stress too difficult to handle on your own.