Some principles from the Family Code of the Philippines Articles 194, 195, 200
On certain parameters in demanding support: "The amount of support to be given shall be in proportion to the resources or means of the giver and to the necessities of the recipient"
On the obligation of the other party other than the father: "When the obligation to give support falls upon two or more persons, the payment of the same shall be divided between them in proportion to the resources of each”
And the spouse is not allowed to gain or get compensated from the support at the expense of the father.
Assess if applicable if this case is filed in court. When the court gives it decision, both parties must conform if not, the guilty party can be liable.