I agree. You say you want to protect your mom well then report the man who is abusing you. Because if ypu don't and trust me I dont meant to scare you or anything but if this gets out before you tell someone not only will he go to jail but your mom might also be in trouble with the authorities since she should have noticed or done something about it. As for the bleeding it most like is scraping of the anal walls due to constant abuse.Those small cuts are thus not allowed to heal properly and so with every evacuation the cuts or sores may get infected. Right now it might be nothing but if it continues then it might turn to something more serious.