Kingdoms and Families are two of the various taxonomic groups, into which organisms are classified;
The classification system begins with the largest taxonomic groups, domains, divided and subdivided to the smallest group, species, and the grouping is based on genetic closeness/similarity;
A greater genetic closeness/similarity is indicative of greater physical similarity;
Kingdoms are a broader/larger taxonomic group than families, meaning that members of the same family are closer than members of the same kingdom, and hence are more likely to be more similar;
The answer, therefore, is the two organisms chosen from the Pinaceae family.
