You have entered correctly 50% on your side. You also should enter 50% ( duplicate same entries) under your wife's rental property records.This will account for 100% of purchase.
The reason you see only 25 % on your return is due to the Half Year rule : you are entitled to only half of depreciation deduction in the year of additions, because you have not owned asses for the full year. Next year you will see a full deduction.
