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There is absolutely NO requirement for the 401(k) income to be periodic, in order to be split.

From an FTC point of view, US pensions are not subject to the 15% limit, and the early withdrawal penalty IS allowable along with the regular tax, even if this pushes you above 15%. This has been accepted by CRA for well over a decade. This was the resolution when many began "transferring"...

She can sell from anywhere in the world.

There is no reporting of annual "internal" income, only withdrawals.

The treaty says nothing about FBAR, 8938, and so on. so one needs to know the requirements of each form, and how all of their accounts under their control is valued, and structured.

CPP and RRSPs and Cdn RSP are all treated differently, but to answer your simple question of BC pension: If the person is a Cdn resident, the BC pension will be txed at normal rates in canada, and also fully reported in on 1040 as pension, with any Cdn tax credited on form 1116 against any US tax on...

As to the exclusion, since you will both be reporting half the sale, you each get 1/2 of the exclusion. I would not put it solely in your name (why do you think this would make it easier later?)

401(k) income IS eligible for income splitting (not IRA) and (except for QC) eligible at any age.

CRA accepts you splitting the foreign (or not, your choice).

You can change your split election for past years.

If you would need to file a return as a true non-resident (ie. in year(s) following your emigrant year), you would pay a federal non-resident surtax, which is likely higher than most provincial taxes.

Incorrect, olive. A provincial return IS required in the last year of partial residency, as provincial tax is owed on the income received while still resident.
The province where one resided on the last day of Cdn residency is to be used.

Sure.
Just be warned that it'll cost you north of $1500 for that per year.

Cali taxes ALL internally generated income, including any triggered cap gains. A good practice is to bump up the book value of your RRSP holdings by swapping them into other investemtns before leaving for California. As to how you will file in the first year in US, there are dozens of posts on that,...

You will be taxed in all jurisdictions, with credit given in Canada on the taxes you owe in US and Cali.

In California only, RRSPs are not protected, so you will pay Cali tax on your RRSP internal income, and IRS and Cali tax on your TFSA internal income.

To be a deemed non-resident (DNR), you need to meet the treaty definition of US residency, which means, in your case, making US your centre of vital interests, In short, in means that you should not visit your family in Canada, they should visit you. Your trips to Canada should be VERY limited and N...

You first need to determine if you will be able to break Cdn tax residency. By having a house and spouse in Canada, one must take extraordinary measures to become a "deemed non-resident" and to be treated as a non-resident.