Jent1159, you might be surprised but I believe it because it happened to my father, who was a baal tshuva at age 40.
In 1964, my family was eating dinner one night when he told us this story. He was on his way home from work and standing in the subway platform when he saw his mother and grandmother on the Manhattan bound platform waving to him to come to them. This startled him since they appeared as flesh and blood but had passed away in the 1930’s.
His train then arrived . The following morning, getting off the train on the Manhattan-bound platform, as he stepped on the spot where he had seen his mother and grandmother, he had the stroke that killed him. He died on the spot.
My father was the 3rd generation in his family and was by 1948 they were totally assimilated. As a condition of marrying my mother, he agreed to kashrus and shmiras Shabbos. It took great misiras nefesh in 1948 to tell his boss he would no konger work on Saturday and to face the ridicule of his family. I was the first boy in his family to have any Jewish education in 60 years and he lived long enough to make sure that both myself and my younger sister were enrolled in Yeshiva high school ( my sister ahd just started Esther schoenfeld in boro Park weeks before he died ). He was rewarded with 2 frum children, 5 frum grandchildren and, so far, and 9 frum great grandkids.