I know there was us agent, war machine, etc but it never felt the same as the "families" that D.C. Started to foster where they all were working together a lot. Batman had a family and legacy with Robin and batgirl characters. Flash was one huge speedforce family. Supes post doomsday had steel, super girl, super boy, etc. Wonder Woman had wonder girl. Diana replaced her mom as WW, black canary was picking on the legacy from her mom, And so on. Then pre 52 you had the JSA being the "old guard" to the JLA new to John's JSA and Robinson's starman I loved that stuff!
Marvel seemed terrified of sidekicks like the ghost of Bucky loomed over them for decades.....except for rick jones.
See, I think you're showing you're bias a bit here. I will show you my own to illustrate what I mean: I do not care if Flash is Wally West or Barry Allen, to me they may as well be the same person. I did not even realize one of the four Supermen from post-Death of Superman was the Eradicator until recently and I know virtually nothing about Steel. And so on.
War Machine, Thunderstrike, Beta Ray Bill, Scott Lang, Ben Reilly, U.S. Agent, they're all hugely significant characters to me. They are families. There is definitely a Spider-family right now, a Thor family, etc.
And furthermore most of these characters on either list could not hold a solo title for long and have rarely supported long-running solos with the exception of the Bat-family and possibly later generations of the X-Men
There are exceptions on either side of the fence all over the place but for every successful new Lantern there is a Lantern who was once a rising star and is now relegated to cameo level, so to speak.