it seems from your description that u have an allergic rhinitis
problem in your left nostril
which secondarily leads to watering from your left eye. Our tear drains out through the middle part of the nose, if the nose gets blocked the tear cant drain out and it starts watering eyes. You can take some anti allergic tablet like ALLEGRA
(120 mg ) as 1 tab at bedtime for 5 days and NASIVION
nasal drop ( 1 drop each nostril 2- 3 times) daily for 5- 7 days. You can check out with an ENT specialist
if it does not get resolved. Once the nasal blockage is clear, watering from the eyes will stop by itself.
For your father u can check for the same.