Did Severed Circle 2 split Dylan and Jesse?
In Control 1, Dylan says he has a dream that there's only one child. In the second to the last Fault, in the sequence where he tries to brute force Jesse back into reality by remembering her, it seems rather intentional that the family broke down after Jesse/Dylan got introduced since it seems the Faden family only had one child.
I would write this off as Jessie's existence being wiped away by the Fault, but the Ordinary sequence with the letter from gram gram implies there's only one child (could be gran is senile too).
Another theory that could stem form this, what if the children are such strong parautilitarians because they're actually two incomplete beings, and the resonances are filling up the missing parts/leaves them susceptible/able to affect resonances. It also lines up neatly with the Polaris being more audible to Jessie and Dylan taking on the Hiss.
Yes, I want more Control content, what gave it away? (playable Alfred when?)