This is just off the cuff, but perhaps explain to them you have a busy life, and if they could prioritize what they need from you, you'll do your best to help them out.
This way, you impart that you too have a life, and also that you cannot possible be everything for him, and yet you are showing you aren't dismissing them or their concerns.
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I am not bound to please thee with my answers.
William Shakespeare
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