Obviously, the reason for this entry in the MC2 Family Tree is one Cassandra 'Cassie' Lang aka Stinger of the Avengers. Cassie is the daughter of Scott Lang, the second Ant-Man, who I'm sure most are now at least somewhat aware of thanks to the titular movie. Scott made his first appearance in Avengers (vol. 1) #181 and stole the Ant-Man identity in Marvel Premiere #47. Cassie also makes her first appearance in the latter title, along with her Aunt Ruth and (I'm assuming they're married) Uncle Carl.
There's really only a few tidbits to address. Despite my initial belief that Cassie's mother ( Peggy Rae) was a fairly long-established character, I discovered that she makes her first appearance well after the MC2 branching point in Avengers (vol. 3) #62. As a result, Peggy is not identified by name in the Family Tree above.
With the increase in audience recognition for the Scott Lang iteration of Ant-Man arising from the recent movie, the character has been the subject of a few solo titles which have introduced several new members to the Lang extended family....all of whom are not included for the same reasons I've mentioned previously. So with all that said, I think that's a wrap, people.
Until I run out of ideas or get something terribly wrong and collapse into a puddle of shame, I remain
frogoat