I dislike the thinning because it causes split ends later on, but braiding DEFINITELY works. I still use it on my hair so many years later. You may find that with a young child, braids get pulled out in their sleep, so if you don't know how to french braid, I would learn it and use french braids at night. They are less likely to get pulled totally out.
Conditioner works to help combing through after a bath/shower, but you do have to leave it in for a couple minutes before rinsing it out (a lot of people miss this step and get tired of conditioner).
I also will use the "no more tangles" spray if I have to comb through dry hair, partly because I know it worked on my long thick hair as a child. Also, know that the thicker the hair, the more you may have to use, like make sure you get into the undersides and spray inside several separate bunches of hair, not just the top and/or bottom.