My dear old Mum passed away last year and my sister-in-law is trying to pilfer some of her jewellery, paintings and the silverware. I’m absolutely livid, especially as my brother is being his usual passive self and saying nothing, he’s so hen-pecked! It’s hard for me to talk to him because she’s always there and he constantly defends her, whatever the circumstances. I’m afraid she’ll help herself to things when I’m not there. What can I do that won’t cause a huge family bust up?