My son has salbaheng pinsan, lagi sinasaktan yung 2yo son ko without any reason. What should I do?

I already raised this to the mom of my son's cousin, she's saying na mapang-asar daw ang anak ko, but is that enough reason pra hindi sawayin ang anak nya? Besides, 2yrs older ang anak nya sa anak ko. Please help me, I don't know what to do minsan maikli ang pasensya ko sa mga batang salbahe.