Ki Tetzei contains more mitzvot than any other parsha in the Torah. Many of the mitzvot given to us are complex, confusing, and beyond our comprehension. One, in particular, is the mitzvah of Shiluach Hakan - whereby one must chase away a mother bird before taking her eggs.
That seems like a compassionate request, and I there are different answers as to whether you can only fulfill this mitzvah if you need the eggs or if you are permitted to seek out a nest in order to fulfill the mitzvah.
There are YouTube videos of people fulfilling the mitzvah, and watching them may stimulate some questions, doubt, and interest. But, these videos are also a platform for a family discussion.
I asked my son what he thought of the video and the mitzvah. He was confused. He did not understand the mitzvah. He thought it was wrong to shoo away the mother bird, even though the men in the picture were not taking the eggs away.
We then read some more detailed descriptions of the mitzvah - specifically, why this mitzvah is compared to the commandment of honoring your mother and father. THAT was an interesting topic for my 11-year old son.
I don't think he's ready to go out and fulfill this mitzvah. We like to make sure the mama birds in our backyard are comfortable and protected. But, we definitely have a different understanding of it.