Indiana Code Title 3. Elections § 3-11.7-3-2

(1) is unable to read, write, and speak the English language;

(2) has any property bet or wagered on the result of the election;

(3) is a candidate to be voted for at the election in any part of the county, except as an unopposed candidate for precinct committeeman or state convention delegate;  or

(4) is the spouse, parent, father-in-law, mother-in-law, child, son-in-law, daughter-in-law, grandparent, grandchild, brother, sister, brother-in-law, sister-in-law, uncle, aunt, nephew, or niece of a candidate or declared write-in candidate to be voted for at the election in any part of the county, except as an unopposed candidate.  This subdivision disqualifies a person whose relationship to the candidate is the result of birth, marriage, or adoption.