In my neck of the woods that would only be considered a "family gathering". You will see that group on a fairly regular basis (holidays, birthdays, quiet weekend, etc.) A "family reunion", indicating reuniting of family that doesn't see each other so often, extends further – at least five or even six generations.
But also 4 kids is nothing for a Bin Laden. Maybe if you multiply by 10...!
I'm assuming there's a mixup here with what you take the word "generation" to mean? A generation is generally all the people of a rough age group, so your parents and your spouse's parents are from the same generation. A generation is usually considered to be roughly 25-30 years wide, since that's about when people have kids. I wouldn't really say it's realistic for six generations to attend, that would mean everyone involved had their kids once they turned 18 and the oldest one attending is still 108 years old.
No mixup, but the intent was to mean where the most recent common ancestor goes back five, maybe six generations. The eldest generations may not be in attendance (or alive), but their children, grandchildren, great grandchildren, great-great grandchildren... That is the point where, around here, family starts to fragment enough that they rarely see each other but still maintain enough ties to want to occasionally reunite.
In my neck of the woods that would only be considered a "family gathering". You will see that group on a fairly regular basis (holidays, birthdays, quiet weekend, etc.) A "family reunion", indicating reuniting of family that doesn't see each other so often, extends further – at least five or even six generations.
But also 4 kids is nothing for a Bin Laden. Maybe if you multiply by 10...!