If your great at chem and cal. great. To be a well rounded (hands on doc.) keep taking the bio's. Plenty, of them to keep you busy. It looks great academically. But if your going to be more behind the scene(lab. doc) with research, then chem maybe be the way to go. I personally hate chem, and lets not get started on the Geo's, but they want a few classes in everything, so you really can't go wrong academically with taking a variety. Looks like your headed on the right track. You should get into some physics classes.
Just think about this for med school: they look for well rounded students who have taken many different sciences but a strong track in something(bio, chem,etc). Then the GPA comes into play, if it's high your in, if not you'll be taking pre req's for a year. May I suggest going to 2 schools, take your classes your not so good at a community school, this way it can never hurt your GPA-they just carry over to the university as credit. Good luck, sorry about your mother, sometimes it takes a terrible loss to produce some of the worlds best physicians. My trac. will be HIV. Who knows, maybe we can make a difference someday