Absolutely, and I'm glad things played out the way they did today. Will was going to wait to tell Paul his intentions re: Sonny until Paul pushed him, and then everything else brought Will & Sonny's plans crashing down. But I was pretty ticked off seeing the complaints (primarily on other boards) about Will being heartless when we didn't know for sure what he'd tell Paul, and today cleared it up.
Edit: And now that I think about it some more, it's still not clear that Will would have told him. Either way, I'm glad he recognizes the need to be honest while trying to be as compassionate as possible, given the crazy circumstances.
That's one of the weirdest things about this show, lol. They established that Kayla would babysit Ari back when she was a newborn, Will even called her Aunt Kayla at the time. I'm sure there have been plenty other instances where they acknowledged their relationship. They only seem to remember the million ways people are related in Salem when it suits their needs. Otherwise, I guess they feel it's too much to keep track of or might creep people out too much.