There's only about an infinite amount.
I could easily claim that Picasso's main purpose was to create art. That has nothing to do with raising a family.
Sure, the bajillions of dollars artists make can feed a family, but they could have opted for other forms of income, raised a family, and not made anything in the art world.
How about Tesla?
What if my purpose is to demonstrate decentralized fuel production? I don't see anything there directly related to a healthy family.
Again, there are nearly infinite examples.