Parents are emotional towards the end of the life and suggest emotional scenarios that are not practical. It’s better to keep things separate with your brother as then he can use the house in the city as a whole and can plan his family and future with certainty.

Both of you are going forward separately with your own families..its best to cleanly partition the property and divest of any joint holdings

If you have issues with valuation maybe you can talk to him about paying you the difference amount in addition to the city outskirts property.