2011 Hyundai Sontana that has been started in 90 days

Simply a dead battery. Even a normal draw on a parked car is supposed to last from 90 - 120 days maximum. No matter about lights, the security system and normal battery loss will usually prevent start after about that amount of time...90 days. Nothing to worry about, you may or may not need a new battery....but put a trickle charger on it before buying a battery, matter of fact before jump-starting.

Now an unsolicited piece of advice: Start and drive the car, run it through all it's gears, get it up to 60 mph for at least 15 minutes at least one time every two weeks. Then it will be fine.