When my father died he left a will splitting everything 50/50 between myself and my brother. My brother tried to claim the will was invalid because it was written before he (somehow) produced a sprog with his ex, therefore my father had a grandson. Claimed that this meant he should get more. Also tried to hide certain documents (such as shares my dad had in RR), took my father's car without permission, was desperate to take the drinks cupboard (probably well over 2000quids worth (lot of single malts, dad collected) and a couple of other things.
Our relationship was already pretty poor, and I knew he was a c**t, so, it was no surprise.