As a matter of fact, Linksys is owned by Cisco. Not that it puts Linksys into the business class, but they do get to tap into Cisco's expertise.
Not quite..... I'd call Linksys premier economy, a bit like Netgear.....
You should remember Linksys is an acquisition, not a spin-off. So "family privileges" are limited.
One of the key differentiators for business class is post-sales support. You won't get to talk to Cisco TAC as a Linksys owner.
There are other differentiators too (e.g. you won't find IOS code on a Linksys.), but that's what I would consider as one of the main ones if you're planning to call something business class, because for businesses support and quality of support is more often heavily weighted than the product itself.
Another way to look at it is Ford.....
From 1994 until 2007 Aston Martin was part of the Premier Automotive Group, a division of the Ford Motor Company.
How much of an Aston Martin crept back into your Ford Mondeo ?
The word is "Business Units" .... and the height of the Chinese Wall between them depends on parent company policy. I would say Cisco's wall is fairly tall.
In IT, you get what you pay for a.k.a speed, quality, price, pick two