How do They Determine if a Kid is Right or Left Handed?

I would assume they start using their left or right hand, and determine that they are left or right handed.

Or is there some process I don't know about either?

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Hand preference is highly genetic. It's not determined; it's observed. Children typically show a dominant hand by age 2-3.

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Some children may be ambidextrous until they're 5 or 6, when they finally make a choice.

Some, but very, very few.

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If they start fricking the same sex, they are left handed.

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Since we live in the 1700's in this thread, I am going to cast a demonic spell on you.

In all seriousness, there is a continuum of handedness, some people who are left handed are able to do more fine motor skills with their right hands, but they haven't figured out if that is environmental. There is a complex genetic component that goes along with it as well.

I strongly favored my left hand pretty early on, but I am strongly left handed. I am also left footed and left eye dominant. Some left handed people are right footed and some are right eye dominant, or any combination of the three.

They choose the same time they choose whether to be gay or straight

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I strongly favored my left hand pretty early on, but I am strongly left handed. I am also left footed and left eye dominant.

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same here.

It should be a simple matter of observation. When he eats, what hand does he use to pick up a fork or spoon?

I do everything right handed except shoot a basketball and drive. I can't explain it

I do everything right handed except drive, and it feels like if I wanna carry something I'll use my left hand, but that's probably so I can use my right hand to open doors/shake hands or whatever.