I'm almost positive that you would need two accounts. You can set one as your primary so that everyone can use PS+ on that one, but you'd probably need a second PS+ for the other one.
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That's what we thought. He could play on either system, but the rest of us could only play on the one that he had marked as his primary system, right?
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That's how it should work. Again, I'm not 100% sure, but it's really confusing sometimes.
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Thanks! It is confusing. When we first got Destiny I wasn't even entirely sure I could play it on my own account, because at the time I didn't know about the whole "primary system" thing.