Notes:

Data from the 1930 Census indicates that Betty was living in the home of her uncle, Thomas King, in Middleton, Ohio. The family cannot have been in Ohio very long, as each member, including six-month-old Betty and 1 year old Thomas King, Jr., were all born in Kentucky.
Betty's son Tom Swier believed Betty to have been born in Hazard, Perry County, Kentucky. Betty told Patti Cunningham Swier that her maiden name was Campbell. In 1930, a marriage record for Odis Campbell and Martha Trusty appears in 1930 in Kentucky.
The 1930 Census states that Martha is married, but her last name is given as Trusty, as is the name of her daughter Betty. I have several theories:
1) Martha was married to a man surnamed Trusty, divorced, and moved in with her sister's family while the divorce became final. Martha remarried Odis Campbell, who adopted Betty.
2) Martha was not married, but perhaps engaged and was not truthful with the census-taker because of her child. The father of her child could have been someone named Trusty or could have been Odis Campbell; it was not uncommon to send unwed mothers away to a relative somewhat removed from home in order to prevent scandal. If Odis was not Betty's father, he adopted her.
3) Martha was married to someone surnamed Trusty who died. She married Odis Campbell and he adopted Betty.
I am fairly certain the Martha and Betty Trusty in the home of Thomas King in 1930 are my ancestors:
1) The age of Betty is right for the date of her birth, as is the state.
2) Betty gave her mother's maiden name as Martha Trusty to Patti Cunningham Swier.
3) Betty told Patti Cunningham Swier that her cousin Thomas promised to buy her a box of candy if she named her newborn third son after him. Thomas King, Jr. would, indeed, be Betty's cousin and close in age to him as well, which would indicate affinty if they grew up near each other.
Census data follows:
1930 Census, Butts County, Ohio
Middletown
Enumeration District 9-39
Sheet No. 15B
Enumeration Date April 10, 1930
Line 52, House No. 2202, Dwelling No. 324, Family No. 345, King, Thomas, Head, rented home, $19/mo., male, white, 30 years old, 25 at first marriage, able to read and write, born in Kentucky, father born in Kentucky, mother born in Tennessee, State or M.T. code 80, speaks English, Occupation: Laborer, Industry: Steel Mill, Class of Worker: W, Actually at work: yes, Not a veteran,
Line 53, King, Nona, Wife-H, female, white, 22 years old, 17 at first marriage, able to read and write, born in Kentucky, father born in Kentucky, mother born in Kentucky, State or M.T. code 80, speaks English, Occupation: Servant, Industry: Private Family, Class of Worker: W, Actually at work: yes
Line 54, King, Paul, son, male, white, 6 years old, single, born in Kentucky, father born in Kentucky, mother born in Kentucky, State or M.T. code 80, Occupation: none
Line 55, King, Buford, son, male, white, 4 years old, single, born in Kentucky, father born in Kentucky, mother born in Kentucky, State or M.T. code 80, Occupation: none
Line 56, King, Thomas, Jr., son, male, white, 1 3/12 years old, single, born in Kentucky, father born in Kentucky, mother born in Kentucky, State or M.T. code 80, Occupation: none
Line 57, King, Alice, mother, female, white, 53 years old, widowed, 21 at first marriage, able to read and write, born in Kentucky, father born in Kentucky, mother born in Kentucky, State or M.T. code 80, speaks English, Occupation: none
Line 58, King, Lucy, sister, female, white, 18 years old, single, able to read and write, born in Kentucky, father born in Kentucky, mother born in Kentucky, State or M.T. code 80, speaks English, Occupation: none
Line 59, Trusty, Martha, sis-in-law, female, white, 19 years old, married, 15 at first marriage, able to read and write, born in Kentucky, father born in Kentucky, mother born in Kentucky, State or M.T. code 80, speaks English, Occupation: none
Line 60, Trusty, Betty, niece, female, white, 6/12 years old, single,born in Kentucky, father born in Kentucky, mother born in Kentucky, State or M.T. code 80, Occupation: none

Betty married David Edwin SWIER in 1945 in Dayton, Montgomery County, Ohio. David (son of Walter SWIER and Laura Helen SCHMIDT, son of Omar Alfred GEARHART and Gertrude Nettie PERKINS) was born on 29 Dec 1921 in Spokane, Spokane, Washington, USA; died on 29 Jul 2001 in Selah, Yakima, Washington, USA; was buried on 2 Aug 2001. [Group Sheet] [Family Chart]

1. David Edwin SWIER, Jr. was born on 16 Nov 1946 in Letcher, Kentucky, USA; died on 02 Feb 2017 in Troy, Miami, Ohio, USA.
2. Walter Randall SWIER
3. Thomas Ray SWIER
4. Richard Lee SWIER was born on 13 Sep 1952 in Washington; died on 27 Mar 2011 in Yakima, Washington.
5. Deborah Lynn SWIER

Betty married Daniel VINCENT [Group Sheet] [Family Chart]

Frank married Martha TRUSTY. Martha (daughter of Lindsey TRUSTY and Angeline WAGES) was born in 1909 in Kentucky; died on 22 Aug 1968 in Sidney, Shelby, Ohio, USA; was buried in Sidney, Shelby County, Ohio, USA. [Group Sheet] [Family Chart]

Notes:

Died:
Age at Death: 59

Lindsey married Angeline WAGES. Angeline (daughter of Wilson WAGES and Sarah Elizabeth DAVIS) was born in 1866 in Magoffin, Kentucky, USA; died between 1930 and 1940 in Kentucky , USA. [Group Sheet] [Family Chart]

Samuel married Mary TRUSTY. Mary was born in 1852 in Kentucky; died in 1879. [Group Sheet] [Family Chart]

Wilson married Sarah Elizabeth DAVIS on 27 May 1852 in Morgan, Kentucky, United States. Sarah (daughter of Edmund DAVIS and Winifred SANDERS) was born in Jan 1833 in Magoffin, Kentucky, United States; died in 1872 in Magoffin, Kentucky, United States. [Group Sheet] [Family Chart]