If someone mistakenly break something in your house, should they pay?

My cousin recently invited friends over for a little drinking. Maybe about 6 to 7 people. One person who was a little drunk, bumped into a gl end table and broke the gl in two. My cousin demands that she pays. The girl won't pay and said, it was an accident. Now my cousin is going after her brother, which is who the girl came with. Should he pay? Is my cousin wrong for demanding payment? The end table was right by a walk way.