Home schoolers...

Would you kindly educate me on how,that is SUPPOSED to work please?
Have a neighbor that home schools their kids. Never see them leave the property, never see any visitors. How are these kids going to learn any social skills? Kids will often try to strike up a conversation with me...99% of the time it is when very busy.....most days one of them is outside herding their goats around the yard while Dad is barking out orders. Will often see them running up and down the driveway...this is often after I hear Dad screaming about something, so I don't know if this running is supposed to be some sort of gym class or a simple punishment of sorts.
Would really like to understand how home schooling is supposed to be done...simply because I am curious.
I often wonder what these kids are missing out on...not because of the home schooling but because of how it appears to be handled. There is girl, believe she is about 13 or so, the ten year old boy and then a cousin, believe the little girl is 8 or so. Have my suspicions on how where these kids are heading but...
So please do educate me...
Thanks in advance for helping me learn sumtin knew...