All happiness is rooted on purposive and positive mental ideation of one's existence. Having children will affect your mindset and worldview; for almost everyone I know this change has been positive.
> All happiness is rooted on purposive and positive mental ideation of one's existence.
This is just one of many views on the nature of happiness. For example, Buddhists have another view on it, including the possibility of achieving the unconditioned happiness (nibbana).
> Having children will affect your mindset and worldview; for almost everyone I know this change has been positive.
"Almost", so there's still a chance it could be a negative change on a personal level, even before considering genetic risks. I think a gamble like that can't be suggested to a depressed person.
