This function dds a column order
by comparing which familial member
has more of the outcome. This is done per pair (i.e. row).
check_sibling_order(data, outcome, pair_identifiers, row)
A character string signifying which familial member (1, 2, or neither) has more of the outcome.
The data set with kinship pairs.
A character string containing the outcome variable of interest.
A character vector of length two that contains the variable identifier for each kinship pair.
The row number of the data frame