@Irishroze ugh. If your mom is the caregiver to your dad (I'm so sorry) it is very common for the patient to lash out at caregiver. Tell mom not to take it personally. This happened to my mom when dad got cancer.
From a mindfulness understanding, your dad is suffering, loss of function of any type is traumatic. So suffering overflows to family in the form of lashing out.
I'm so sorry to hear. I'm glad you are there to support. ❤️