In a one-family residential zone, no building or premises shall be used, and no building or part of a building shall be erected or altered, which is arranged, intended or designed to be used, in whole or in part, for any uses except single-family detached dwelling units, not to exceed one (1) such dwelling unit on each lot.

Notwithstanding paragraph b1 above, a lot may have two (2) dwelling units within a structure where one (1) of the units is occupied by a person who is the parent, grandparent, child or grandchild of the person residing in the other unit. This use is permitted only so long as the condition continues. Upon termination of the condition of relationship, the lot will revert to one (1) dwelling unit.

Notwithstanding paragraph b1 above, a lot may contain two (2) dwelling units within a structure where the structure is owned by a senior citizen and where one (1) unit is occupied by a senior citizen tenant. A "senior citizen" means a person who is at least sixty-two (62) years of age and has an annual household income that does not exceed an amount equal to three (3) times the county per capita personal income as last reported by the Department of Labor and Industry on the basis of the United States Department of Commerce's Bureau of Economic Analysis data. This permitted use shall expire upon the individual's failing to qualify as a senior citizen as set forth herein.

In no event may the uses permitted by paragraphs b2 and 3 be combined to create three (3) or more dwelling units on one (1) lot. An affidavit to this effect will be submitted when required by the Construction Code Official.