I've seen this story before about the Indian woman who was kidnapped by a sasquatch and later escaped pregnant, giving birth to a son named Patrick. But this is from a different source and is a longer, more detailed version.
It's from a book written in 1992 by Dr. Ed Fusch (Anthropologist), "Seweneytl And The Stick Indians Of The Colville"
"Informants: Francis, an Indian woman, age 60 and niece to Patrick, described later, and her mother, Laura, age 85, are members of the Lake Band. Francis pronounces "Skanicum" as if clearing her throat with a mouth full of saliva. This interview with Francis on September 17, 1985, was followed by another with her mother, Laura, at her separate residence at Nespelem. Laura (deceased in 1987) verified everything as reported by Francis, adding many details.
Back around the turn of the century (1885-1900) the Indians set up a fishing camp near Keller on the San Poll River. In the evening the men would return, tired and hungry, to camp with their days catch. The women would work all evening processing the fish and putting it on drying racks to dry. While cooking dinner one of the women, a recent bride through bride-purchase, took a kettle and went off after water. Minutes later she was heard screaming. The men rushed to the scene but could only stand and watch as Skanicum carried her off. They knew that Skanicum was very vengeful and if harmed the captive may be injured and the mountains would not be safe for any Indian. As she was carried away, the captive tore off and dropped pieces of her white slip leaving a trail for the men to follow. She was with Skanicum all summer, or at least a couple of months, when the men searching for her on horseback saw her gathering wild potato roots.
Skanicum was asleep nearby. Upon seeing the men she emptied her lap of the potatoes, crept quietly to them, leaped on one of the horses behind it's rider, and thus escaped. Upon return to camp all of the Indians immediately broke camp and hastily departed the area. During her stay with Skanicum the woman had gathered roots, etc., which they shared. Skanicum eats anything that other people eat but lives primarily on roots such as that of the thule (tooly) or cattail plant, which they gather, dry, and store in caves. They build fires with flint stone and steal hides from Indians, which they use for bedding and to cover the entrance to their cave.
During her stay with Skanicum the woman became pregnant and bore a son named Patrick, who grew up on the reservation. Patrick's body structure was very different from that of other Indians as his arms were very long, reaching about to his knees. He was very short, about 5'4" tall (his mother was described as "tiny"), possessed a sloping forehead, very large lower jaw, a very large wide mouth with straight upper and lower lips, and straight protruding teeth. He was kind of stooped, or hump-backed. His ears were elongated upwards (peaked) and bent outward at the top. He had very large hands and long fingers, is described as very ugly although extremely intelligent. He attended school on the reservation, was "very smart", operated a ranch in the area, died at about the age of 30, and is buried on the reservation. Patrick is described as a "gentle" man, never beat or mistreated his wife. He married easily as he had a good ranch and was considered "affluent". From this marriage to Laura's cousin was born three daughters and two sons. Both sons died at an early age. The three daughters were named, in order from oldest to youngest, Mary Louise, now about 65 years old, Madeline, and Stella. Stella died at a young age. Mary Louise lives near Omak. A couple of summers ago Mary Louise spent several weeks with Laura. Mary had heard several times over the years that her paternal grandfather was a Skanicum and sought verification from Laura. Laura revealed all to her, confirming that her father was indeed half Skanicum. Mary Louise' physical appearance is relatively "normal". However, both girls have wide mouths (look like split from ear to ear), protruding teeth, and squint eyes. But Madeline, who lives on the Washington coast, has other very distinct Skanicum features such as sloping forehead, long peaked ears, etc. She is considered ugly by Indian standards, is an alcoholic spending much time in taverns. Patrick's wife, mother of these girls, is Laura's first cousin.
Francis met Patrick when she was a young girl about eight years old. She reports another incident in about 1982 when she and her niece were returning to Nespelem from Omak just after dark. About two miles from Omak near a gravel pit they passed a Skanicum standing alongside the road.
About a year later Francis and Laura were returning home when they stopped up on Keller Butte to eat chicken that they had brought back with them. They heard Skanicum scream only a short distance away. So close in fact that they quickly left the area. There is a cave near Kartar on the reservation where Skanicum is known to live.
Laura reports that some years ago she shot a deer not far from Nespelem. Being alone at the time and unable to load it into her car, she returned the next morning with her grandson. Several Skanicum were on the scene. One, a female, was standing just alongside the road and never moved as Laura drove by her, getting a good look at her. She looked human, was about six feet tall, her body covered with long brown hair, had a sloping forehead with ears that appeared to be pulled upward. Arriving at the deer carcass they found that the liver had been removed, as had the tender parts of both rear flanks. The skin had been carefully rolled from the hindquarters; the meat was very clean (she reiterates and emphasizes how clean the meat was). She and her grandson left the carcass as they found it and left the area. Laura states that there are areas just south of Nespelem and about two miles north of the Columbia River where she can call Skanicum (in his language, she knows how) and he will answer. She believes that they live in the area. At one time she encountered a large male Skanicum on the highway near Nespelem. It tried to converse with her, making organized sounds, leaving her to believe that they have a language. She left quickly.
Louie, a 79 year old male member of the Columbia-Moses Band, knew Patrick all of his life and remembers him and his family well. He worked for Patrick on his ranch around 1925-1930, describes him as a "pinhead" about 5' 4" tall, with larger than normal ears, mouth, teeth, and with large hands he was a very good card player who seemed to instinctively know what everyone else was holding.