Hi
Norma,
This is Just a thought,
Could Mary be the mother Of Julia Schultz & Owen the Uncle,
Could your Mary of possibly married Owen's Brother first & then either widowed Or Divorced & then married Owen & Julia being the daughter of the Brother?& Mary
ill tell you why, On the 1911 Census I have My Gr,Grandparents, Emily & David Flynn, with three Daughters & One Niece, But the Niece was actually Emily's daughter & David's Niece, Confusing when i first looked, But turned Out that My Emily Married david's Brother Edward first & had 2 Children, then She was widowed & Married David,
So stated On Census as Niece Of head of Household, But Of Course Daughter Of Emily!! Hope this Makes Sense :-)
Just a Theory
Hope you manage to find Info Re-Your Julia Shultz
Good Luck
Best wishes
Lisa