Hi ciderdrinker
Wow thank you so much for taking the time, what a huge cache of info you gathered so quickly! A lot of it is familiar, but there is some wonderful new stuff too.
It's extremely interesting that you found another brother, Godfrey Alexander. His daughter Anne was baptised as an adult in 1837, and the baptism record states that she was a Jewess by birth. It seems some of Godfrey's children ended up in Australia, there is quite a lot of info on Ancestry by that branch of the family.
Godfrey married his wife Frances in the Great Synagogue in London in 1808. One of the trees on Ancestry has Issachar Ha Cohen as Godfrey's father, it's not necessarily correct. But I've noticed 'Ha' added to quite a few of the older Cohen records I've seen, do you (or anyone!) know what it means/signifies?
I will go through all of your info carefully (thank you again SO much) and see where it leads, and what it is possible to prove at this point. What is interesting is that Matilda seems to be a family name. It is also in the 'other' Judah's family. And one of the Esthers you found (I think I saw that record too) seems to have been born in Holland. So the hypothesis that both Judahs came from Amsterdam I think still stands for now. What do you think?!
Best, Colee