DEAR ABBY: My wife passed away two years ago at age 40 after a long bout with cancer. We had three children, ages 7 to 12. I am 44 and engaged now to a wonderful woman. We are planning to have a small wedding with fewer than 50 guests. While the kids and I are doing well, my late wife’s mother, “Karen,” is still grieving. She has a forceful personality and can be quite pushy. She lives nearby. We have not finalized the arrangements or sent out invitations. Karen has been asking if she and my former father-in-law are invited, but ...