my dads been shady and jumpy lately so I went out to his workspace in the garage and there are lots of aluminum foil and when I unroll them it looks like weedmaybe I'm just assuming
If you have AC then you need to get that attic insulatedYou can go to home Depot or lowes and buy the insulation and get the blower for free to do it yourself (or a friend) to save money.
As you can afford it, buy fiberglass batt insulation at the home center and install it yourselfUse a dust mask so you don't inhale glass fibers, not good for your lungsA fast way is to hire a company to blow in fiberglass, this is quick and painless but a bigger shot of money at once.
That's possible, alot of people do that, but most comes in small bag or bottleBut yeah it's probably weed I the tin foil, but don't get mad at him he's only doing it because it's awsome and isn't going to hurt him also, it's healthier he does that then smoke tobacco or drink alcohol