You can not acquire the virus in that way. There is no scope of transmission.
you know the answer to this based on your last thread. AnxiousNoMore gave you the 3 ways that HIV could be transmitted in adults. you can continue to ask a variety of different scenarios, but your answer will always be the same. I'm assuming you're talking about you and your dad, which seems odd. personally, it would always be odd to me to share a toothbrush with anyone.