The way they left off in TNG, everything seemed ok between Worf and Alexander.
Worf seem to accept Alexander and they appeared to be close.
Then with "Sons and Daughters", Alexander reveals that Worf never tried to contact him in years, and then it makes you go, "Wow, Worf is a jerk".
It doesn't totally change how we view Worf, but it did make you wonder about the guy.
Still, Alexander's portrayal in that episode was memorable, although a little weird...