Inspired by the other thread, this was our family scenario. My dm is one of two sisters. As they were growing up, their neighbours were unable to have dc and doted on my dm & her sis. They even had a gate put in the garden fence so the two little sisters could go & play in their garden. Roll on I don't know how many years and the couple die. They left their entire estate (which was considerable) to my aunt. My dm was gutted, she got nothing, not even a keepsake and she really loved that old couple. Her sister never offered her a penny and my dm had to watch as her dsis had her entire house overhauled. New kitchen, bathroom, total redecorate, new carpets, new driveway & car, new roof & slightly bizarrely - all new internal doors
That lot was followed by a succession of nice foreign holidays and a couple more new cars the following year. My dm felt very jealous and their relationship has never been the same since. 'Scuse my French but I think she was a cunt.