alejandro--
my only piece of advice would be to work hard to develop your relationship with her BEFORE you fall in love with her child (which is likely to happen--kids are cute!). go on "real dates" without "junior" so that you can see her as a romantic partner first, and as a mom later on.
the only reason is that if you get involved with both mom and kid at the same time, and then break it off for whatever reason, it's likely to be hard on the child.
my husband dated a woman with two kids before we met, and although the breakup with the woman was handled relatively well, the kids were hurt by it (and so was my husband, who really loved them).
good luck!!