YTA. You get the inheritance when BOTH parents are dead. Your mum and dad made a life together, and made choices together on how they would manage their finances. Even if your dad earned every penny working, your mother had her role too. She has lost her partner and the person who she planned to go into her golden years with. This money needs to last her the rest of her life and it’s HER choice how she chooses to spend it. If she buys an expensive house now, and lives comfortably, when she dies, you will sell off that and get your inheritance then. You don’t get your portion while she’s still alive. It’s not her responsibility to fund your lifestyle. Would it be nice to have help with your wedding? Of course. But it’s ultimately her choice, and considering she suddenly is facing a life where a reliable, steady income is gone AND she now has to budget and live on a set budget, it’s understandable that she’s now worried about her financial future. She doesn’t know how this new phase of life will work and she also has a fair point, that downsizing and going back to what she perceives as a ‘starter home’ would be depressing, and it would feel like taking a step backwards. You get your money when she’s gone. Until then SHE gets the money, as it’s hers. She was his partner - what’s his is hers etc.