I believe you are referring to Maraget Ann Ardiel (b. Sept. 16, 1824, d. Nov. 29, 1902), 7th child of Leonard Ardiel (b. 1773, d. July 16, 1843) and Rebecca Carry (b. Mar. 1778, d. Dec. 14, 1866). Margaret Ann was not the first white child born in London Township but it is quite fair to say she was probably one of the first couple dozen.
Margaret Ann married Samuel White (b. 1830, d. 1918). Their 7th and final child, Deborah Margaret Ann White (b. 1865, d. 1893) married William Wilson (b. ?, d. ?) of Prospect Hill. Their 2nd of 2 children was Sara Margaret (b. 1889, d. ?). She married William Ewin and they had four children: Miriam, William, Margaret and John. You must be a grandchild William or John.
My tree ends there. Please help me fill in the rest.