mother and mother in law,who is more important?

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don't make me wrong,please.i haven't got married,i asked this question for my father.lol. yesterday was my father's mother's birthday,and we-my father,my mother and i, have planed to celebrate in a big restaurant in the afternoon.but what a coincidence!my father's mother in law happened to break her ankle at noon,of course,my mother and my father sent her into a hospital and had to look after her.and it was time to go to the restaurant to celebrate my father's mother's birthday.but my mother was very worried about her mother and had no mood to celebrate.since it was not very convenient for her mother to move,she asked my father to stay and looked after her.it was reasonable,but my nanna's birthday celebration was also very important.so my father was really vexatious.finally,he decided to stay to look after her mother in law.certainly,my nanna got angry with my father...this morning,my father asked me who was more important,mother or mother in law.i couldn't answer, so i come here and ask for your help.lol