Ay, mama, this is really tough kaya I totally get the mixed feelings mo. Honestly, I think letting your husband be there for his mom on that day is the right call, she's grieving and he needs to be present for her, pero that doesn't mean your family has to split completely, kaya maybe compromise: what if you and baby visit them for a few hours on the 31st para hindi kayo completely apart, then celebrate New Year with your husband when he comes home, or the next day? A few of my mum friends who've been through similar losses say that allowing their husbands space to grieve as a son actually made the healing faster and brought the whole family closer eventually. Your feelings are valid, but this particular moment isn't about demanding, it's about showing your MIL that her loss matters to your family too, and your husband will really appreciate that understanding.