Two sisters
S1 23, works in a apprenticeship role, lives at home contributes a small amount to bills
S2 21, at uni had a part time min wage job, gets a small amount from parents
S1 had some Xmas presents in a bag near her door. S2 opened her door (aggressively in s1 opinion) knocked the bag, broke a £10 cup.
S1 feels S2 should replace as it's her fault
S2 feels S1 shouldn't have left a bag near her door
Who pays?