Going to be honest here.
Yes, this would probably raise red flags. Is there anything wrong with what you're asking to do? No, as long as you are never controlling that cleric, this isn't two boxing, and you aren't going to get in trouble.
Be aware, however, that we will often run two-box tests when people don't even know we are around or manipulating the situation to get a desired result. It's pretty obvious when its one person controlling two characters. If I were 'investigating' your two box, I would wait until your 'dad' moved, do a test without you even realizing it was happening, and then nail you if you failed.
tl;dr We don't punish innocent people. If you are twoboxing, we will know. Keep your hands off that second character
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