One will always fight for happiness even when it does not seem so. Even the most normal "family" is fighting for their life. In the end, we are all fighting for our happiness or we just learn to live with what we've got.
I love the feeling behind this, but I find the "just not to rot" dulls and almost confuses the power behind the second line. Then I start thinking, is that thrown in there just so it can rhyme? Maybe I'm just not getting a clear picture of that sentence.
Firstly I thank you for the time that you have spent on reading and thinking about it! That truly means a lot to me. Secondly I am sure that you got a perfect picture of the entire piece and the "just not to rot" part was put there exactly to dull thing a little bit. Since this is a free verse poem a rhyme is not always necessary but without that last sense it flows more like an ironic sentence rather that one that depicts the hypocrisy of life.