Sorry to hear. Waiting to learn more can be the hardest part. For what it's worth, this internet stranger is hoping that it's one of the more easily treatable forms.
Please be kind to yourself, and try to be kind to your family members (without taking any egregious bullshit from them). This may bring out sides of them that they hadn't shown before.
One of the hardest things if this drags on will be allowing yourself to live like normal. You can't live your life just waiting for the call that things have taken a turn for the worse, but you also can't ignore what's going on. It's a fine line. I wish I could offer better advice, but you'll have to find the balance that works for you and that you can sleep at night with.
Just... good luck.