If my breasts are still growing is it likely that I will reach my mom's size? (photo)

You already have gigantomastia and are certainly a candidate for breast reduction surgery.  Under these circumstances, you should see a board certified plastic surgeon who can review your options.  There are insurance guidelines but some differ when presented with gigantomastia.  Best wishes.

Hello and thank you for posting your question. There is certainly a genetic predisposition in your family. We can't say exactly how big you will eventually be but your cup size is already considerably large. If you are interested you be eligible for a Breast Reduction. 

Best of luck

Thank you very much for your question and photograph. It does appear that you are dealing with gigantomastia at this time, although it is difficult to say how much larger your breasts will grow. My advice is to schedule a consultation with a board certified plastic surgeon, experienced with gigantomastia. He/she can discuss your situation and explain your options for breast reduction in the future.