I've seen quite a few threads just in the last few days (not saying you/yours) where people have asked/discussed exercise and responses such as "don't worry/bother, exercise doesn't help with weight loss, it's all about diet" have been repeated by many people. I don't agree with that message.
Whilst that can be the case, you can also eat less than your body needs by increasing your energy expenditure - so long as you are sensible, track what you are doing and eating, etc etc etc. I'm losing weight just now, I'm walking miles every day (where I didn't used to), I'm going to the gym 5 days a week, weighted hula hooping every day...and I am nowhere near eating those extra calories. I don't believe that it won't help with actual weight loss if I am not eating to compensate.