addSecondParents: Add second parent data to first parent data.frame object.
In rmsharp/parentfindr: What the Package Does (One Line, Title Case)

Add second parent data to first parent data.frame object.

1	addSecondParents(id, firstParentDf, secondParentType, columnNames, scores)

`id`	offspring ID
`firstParentDf`	first parent data.frame object for dams or sires portion of the score object dependent on which is the first parent.
`secondParentType`	character vector of length one with one of dams or sires.
`columnNames`	character vector of columns to include from `scores` in dataframe
`scores`	list object with a comparison information for all trio combinations.