Are there laws that override the pre-nuptial agreement?

In Québec, legal provisions pertaining to the family patrimony override any marriage contract or pre-nuptial agreement that the parties may have between them. Included in the family patrimony is the family residence which value would then be separated among the parties. It is important to note however that a distinction must be made between the partition of the value of the family residence and actual possession or ownership of the family residence.

While included in the family patrimony, it is nevertheless possible to deduct amounts from the partitionable value to reflect the fact that part of the net value of the house belonged to either of the parties before the marriage and/or some of the net worth of the house was paid using donations or an inheritance received by either of the parties. For example, if the family residence was completely paid off at the date of marriage then that party would be able to deduct 100% of the value of the house. In this scenario there would be no value in the family residence to share with the other party.

As for your second question, revenue is not included in the family patrimony and could be excluded from any partition of assets by means of a valid marriage contract or pre-nuptial agreement.