The disposal of the principal residence was deemed to have occurred immediately prior to death, so you have correctly recorded it on the T1. The trust has not disposed of the property so there is nothing to record on the T3 at this stage.
There are two other points which come to mind. Firstly, a personal trust can own a principal residence only if it is ordinarily inhabited by a specified beneficiary after the death of the original owner. Failing that, it will be an ordinary disposition by the trust with all the rules pertaining to capital gains or losses.
The second point is just a question of why the trust is establishing a year end so close to the starting date The due date of a trust is 90 days after year-end, so at this point the trust return is already overdue. Would it not make things easier to delay establishing a year end until the estate comes out of probate and can begin disposing of assets in an orderly manner? This is just a thought, not a suggestion.