As someone without kids I typically see my coworkers who do have kids be granted special allowances and bond with upper management over the experience of being a parent, etc
Find a better team—that's not normal behavior.
I'm gonna say to my 7 year old daughter "hey I read this comment on hackernews .. so sorry daddy won't be there to deal with you.. cause I'm like burnt out, so I'm gonna go skiing, take care of yourself"
It's not a bad choice, but treating the consequences of that choice as a reason for slacking at work as being more valid than others when the outcome to the team is the same (i.e. less time doing work) is the issue.