I suppose they all sound like orphan siblings nagging and loving eachother.
The Older brother - protective and wiser;
The older sister - wild and misterious;
The middle child - the leader who gets everyone in trouble;
The younger sister(?) - a little andro-genius; And her(?) awesome sidekick, a super-smart doggy...
At least that's how I see things, not really with parenting or romance involved... Is this what you meant?
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Spike + Jet: Typical best male friends. They love each other like brothers while never acknowledging their relationship. We're too tough to say, "I love you, man."
Spike + Faye: The typical pulling pig-tails/shooting spit-balls relationship. The "I find you attractive but I'm supposed to hate you" factor. Nothing ever happened between Spike & Faye, but everyone (including them) expected it. They both had too much baggage.
Jet + Faye: The potential girlfriend of your best friend. You know she's trouble, but your best friend is just bound and determined to includer her in your plans.