As far as working with your mother if you wanted to knit Continental.... I don't think that will be a problem, especially as you say, later on to do more complicated things. Continental and English are basically the same thing. They form the stitches the same way, wrap the yarn the same way (just accomplish it a little differently), and make stitches that are seated on the needles the same way, and there is very little that you would have trouble adapting. Most knitting books show the bare basics of Continental (if at all) and then just show the needles on how to do things beyond the basics and you just do the same thing as an English knitter, but hold the yarn differently. Once you are comfortable with the doing of it, the other stuff won't be that hard to learn from your mom.
It is really nice to know both methods anyway. I like to use both at the same time for stranded knitting. If you understand both ways you will for sure have no problem adjusting things your mom does English to the Continental style.