Residency is when you did establish your new home (lease/ purchase), get driver's licenses, move vehicles and voting, all the things that say you are really moving here not visiting or checking it out.
There won't be an exact date but you can pick one that makes sense for both of you. Lease or license or some other verifiable method of choice.
1 & 2 Once you pick a date, use it on both returns.
3. Allocate the interest based on where it was earned if possible. Otherwise, allocate by percentage.
@Kevinjjfr
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