P.I.HUNT 5/Makes, Jack, A, Dull

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Spoiler warning: Solution follows

Each of the fill-in crosswords can be completed with words that follow one of the four provided categories:

• ... and ... - Famous duos (either real or fictional)
• No. "4" - Words containing "FORE"
• Play___ - Words that are valid suffixes of the word "Play"
• Makes - Car makes / manufacturers

Taking the indicated letters from each filled-in crossword in the order of the provided categories spells MALE SHARES ONE PARENT to which the final answer is HALF-BROTHER.