Just to put in my two cents.....Yes sinus issues can be hereditary - it has to do with anatomy and predisposition for allergic response in the tissues resulting in swelling. sort of a hyperactive response. Something as simple as using a normal saline spray can help some, but if the issue is with swelling, obviously you are bound to have SOME problems. But every little bit counts, right?
I guess it makes sense. My mum, brother and I have all had odd anatomy in our sinuses which predisposes us to infection. I had surgery at 13 to correct a 95% blockage - my mom and my bro also had surgery as well. Not sure I would make that same decision for myself today, but I've not had repeat sinus infections since then (before that, it was about every other month for several years).