DEAR ABBY: I am a widow. I supported my husband during our entire marriage with no help from his wealthy parents. My husband died before his father did. After my father-in-law’s death, I received nothing. My sister-in-law told me she would give me $5,000, but she would invest it for me and give it to me after I retire. Well, that was 10 years ago. I just retired. When I asked her for it, she claimed she had no memory of it and got angry with me for asking. I argued and said I hated her “stingy” family, and she hung up on me. Should I ask her for the money again? — PROMISE BROKEN IN MICHIGAN D…