The Problem;

Assuming you have a variable that you collected unique IDs like HHIDs and would like to see if there are any duplicates;

#The required libraries
require(tidyverse)

#Load the libraries
library(tidyverse)  

hhIDs_Dups <- 
  DF %>% 
  group_by(hhID) %>% # the group of interest (hhIDs)
  mutate(duplicate = n()) %>% # count number in each group
  filter(duplicate > 1) %>% # select only duplicated records
  select(-duplicate) # remove group count column

If you now View(hhIDs_Dups), you will only see the duplicate records.

Its advisable to add some metadata to your DF like location and other respondent info for easier identification of which record to update/change.