Thank you, thank you Alison for this great news! I feel like the proud grandma..lol
As for Jack...pending confirmation from the MNR, we think it's the same male. I did some research online yesterday and found a few papers on bigamous falcons - apparently this does happen and the one really good article was from the US Midwest biologists. Apparently from what I was able to find out - it's a territorial thing not really about having another mate. It happens in cases where the male either wants to expand his existing territory or where the nest site is already considered a part of his territory. And that is a possibility as TR site is only 2 years old so perhaps this was a part of Jack's territory before or he sees an opportunity to go bigger!!
They said that in these situations the male will try to woo the female in hopes of adding to his territory but that the second nest usually fails because the male will spend more time with his 'alpha' female (their words). They did cite a successful case down there where a male had 2 successful nest sites and raised 8 young in total to fledge however in most cases they said one nest site fails due to the male not being as attentive to his second mate. For me that speaks to our situation at Scarborough here this year where Reuben stepped out on long time mate Lawrie with Linn from Rochester. Both territories are side by side and unfortunately both sites failed this year...so not sure what the full story is there but I know Lawrie's clutches both failed and not sure if Linn even laid eggs but they did mate.
Windwhistler as we know did run 2 sites for 4 years but he had alot of human help! As it's not 'mating' season the situation may correct itself. Apparently if a new male comes along that is strong enough to hold his own against Jack and he tries to woo the TR female and she accepts him then Jack will go back to his existing boundaries. If the TR male recovers and comes back, that should probably do it as the TR female has been with her mate for several years so no doubt she would be happy to take him back.