text: Yes, it is possible for a twelve year old to have depression (I personally had depression at age 12). Some major symptoms of depression, depending on severity, include apathy, significant weight gain/loss, sleeping excessively or insufficiently, hopelessness, suicidal thoughts (please, get help if you do have these:  www.hopeline.com)... there are many more. As you have mentioned, bouts of crying are also indicative of depression. \nOf course, being a teenager, mood swings are also possible, but since you've somewhat expressed that you're upset because of your parents' relationship, ... maybe it would be good to talk to a mentor or couneslor. Good luck.