School can cause so many problems in families I know that all too well.
You trying your best is enough and your family should see that! There are more important things than grades always remember that.
Me messing up most of my assignemnts at school and barely making it through added so much tention between me and my mom. My brain was and still is pure chaos and I can never stick to a time table or do my assignemts on time. Lead to me hating mysef more but I made it to university.

You can get through this and I hope your family will realize that school is not everything especially in a family.