One of the obligations of the parents toward their children is the obligation to provide support (Article 195, Family Code of the Philippines). Being specifically mandated by law, this obligation shall be complied with even if the parents concerned already have their own separate lives. The provision for support shall comprise everything indispensable for sustenance, dwelling, clothing, medical attendance, education and transportation in keeping with the financial capacity of the family. The education of the person entitled to be supported shall include his schooling or training for some profession, trade or vocation, even beyond the age of majority. Transportation shall include expenses in going to and from the school or to and from the place of work (Article 194, Family Code of the Philippines).
Undoubtedly, the child/ren is/are entitled to receive support from their father, even if the Seafarer is on Vacation.
There is such thing as Leave Pay, Subsistence Allowance and Standby Pay during period of unemployment and waiting for new contract.
The Point being is, it does not necessarily follow that if the Seafarer is not under contract and not currently employed onboard seagoing vessel, he should stop providing for his children, this is actually a poor excuse.
Yet, it can be argued if the Seafarer has already been terminated or dismissed and can no longer render service on Merchant Vessels.
Please tell your brother to give support as long as he could or depending on the budgeting he has.