I don't have a family, but I found two things to be really helpful: Going for a 30 minute walk outside around lunch every day, and having lunch or coffee with friends who challenge my thinking once a week. These two things let me reset during the day and lower my frustration at work.
As they say, rest and vest. The goal of this job is to bring in enough money to support you and your family while you work on your fun thing. You can do it!