So, they are колхозники.
Светка-Колька-Юра should work.

People generally addressed someone of older age:

officially (to less known persons) as товарищ/гражданин Иванов, товарищ/гражданка Петрова
officially (to well known persons) as Иван Юрьевич, Светлана Павловна
unofficially as (family friend, for example) дядя Юра, тётя Света