I have no information on Margaret McCullough's parents, but I have Margaret McCullough [b 26 Nov 1849] married John William Tidgwell [b 23 Aug 1849] on 30 Mar 1876
Both died in Stockton Missouri. According to family lore, Margaret was called Meg and she was a fortune teller.
son John was born in New Hampton Iowa, and at one time lived in Oneonta NY [I have no dates]; m Flo Montgomery 24 Dec 1911 in Stockton Missouri.
Elizabeth Riley Tidgwell: b 9 [or 4] Jan 1881, New Hampton Iowa; m. William James Harris 20 Aug 1901, d 27 Dec 1962, buried in Stockton Missouri cemetery
I have a third child: Martha Louise, born in New Hampton Iowa, who married Julius Goodwin and had son Mark b 15 Sep 1912 and son Mahlon Pankey b May 1916. At some time she lived in Boise Idaho.