But let's pretend the tick is infected and the tick feeds for 48 hours. Take some antibiotics and you're fine. Lyme disease is stupidly easy to treat. And no it does not come upon you suddenly. There's a huge rash that covers the infected area.
I'm sorry for what happened to your father and uncle's son. Truly, I am. More awareness should be raised about Lyme disease. You don't need to fear it or spray your yards. If you see the rash go to a doctor.
While many people are concerned after being bitten by a tick, the risk of acquiring a tick-borne infection is quite low, even if the tick has been attached, fed, and is actually carrying an infectious agent. Ticks transmit infection only after they have attached and then taken a blood meal from their new host. A tick that has not attached (and therefore has not yet become engorged from its blood meal) has not passed any infection. Since the deer tick that transmits Lyme disease typically feeds for >36 hours before transmission of the spirochete, the risk of acquiring Lyme disease from an observed tick bite, for example, is only 1.2 to 1.4 percent, even in an area where the disease is common.