If I'd read this a year ago I'd have probably said you were being unreasonable. But after what happened to my friend this year, I think you're perfectly justified.
When my best friend's mum died 6 years ago, her dad was destroyed - they were like a loved-up teenage couple despite being married 50 years and had never spent a night apart. So my friend was shellshocked when her dad introduced his new 'companion' 12 weeks later. She wanted to keep the peace so initially pretended to be happy for him but as time went on she started seeing so many red flags with this woman, who was only 2 years older than my friend. One of them being - my friend was due to buy her first home and her dad had long previously offered to help her with her deposit. When she found somewhere to buy and arranged to see a mortgage broker, her dad confessed that he could no longer help her as he had 'lent' his companion £70,000 (about two-thirds of his life savings, accumulated by both her dad AND her mum) to help her pay off her debts and settle an agreement with her ex-husband, so she could 'draw a line under the past'.
Fast forward to last September. Her dad is seriously ill and bedbound. His now wife (yes they got married after 8 months) is fiercely controlling access to visits, and even to phone calls, even though her dad told her to ignore his wife and she could visit whenever she wanted and he wanted to see her every day and for her to be there at the end. He dies in the first week of October. When my friend goes to the house a week later to discuss the funeral, his wife has eradicated all trace of him, saying she didn't want to 'dwell on the sadness' - his clothes, possessions, trinkets, papers, everything. Gone. The only thing left was a couple of packets of photos, with the bulk of their childhood years completely absent. She was devastated.
Anyway. The point of this rambling post. She then discovers that her dad changed his will in the last three weeks of his life. When he was bedbound. She doesn't know how. Presumably a solicitor came to the house. The previous arrangement, which her dad had explicitly told her when he married again, was that the house would be split between her and her sister eventually but his wife would have a 'lifetime interest' to live in it. Even that was pretty galling, as the wife is essentially the same age so every possibility my friend would never see a penny, but she accepted it. Now, the updated will states that the lifetime interest still exists, but when the house is eventually sold, the proceeds will be split into thirds - 33% to the wife, 33% to the wife's 2 children from her previous marriage and 33% to my friend and her sister. If the wife dies first, her 33% share passes directly to her children. And now, to cap it off, she (the wife) has met someone new, moved into his double-fronted, three-storey Victorian villa, and rather than sell the property so my friend and her sister could get their 16.6% share of the proceeds, she has rented it out for £2,350 per month (it's only a very modest 3-bed bungalow but we're in the south east). Pure profit, after any fees, as there's no mortgage. This income will be on top of his NHS spouse pension that she inherited.
She's so sad. She really thinks her dad was bullied under duress to change the will at the last minute but she's got no evidence or the energy/funds to fight it. And yes, it's partly about the money, but she keeps thinking about how utterly disappointed her mum would be at what's happened. That's what hurts her the most.