Andrew Undershaft Timeline and Summary

Andrew Undershaft comes home to see his family after a long absence. So long, in fact, that he doesn't even recognize his own children . . . or remember how many he has.
Despite the kind of awkward start, he and the kids end up having a nice enough conversation (though Stephen wasn't a big fan of dad initially). He and Barbara agree to check out each other's places of work.
When Andrew visits the Salvation Army, he ends up donating a ton of money, thereby demoralizing Barbara by proving that even her precious Salvation Army is for sale.
Then, the family visits him at his arms factory (and the surrounding town). He ends up appointing Barbara's fiancé, Dolly, as his heir.