It's really hard ap-parent-ly.

Parent-child interaction is cute and all, well sometimes. The children are always cute and a lot of times they're really funny too. The parents aren't always that cute and sometimes they just think they're funny but from the child's reaction you can tell that the child obviously doesn't like it.
And sometimes the parents are really awful, inconsiderate and mean, but usually this does not happen intentionally. Most parents are really trying to be the best parent they can be.
I think, so far, I've spent about 30 hours coding the quality of parent-child interaction and if there's one thing I've learned about parent-child interaction it's that it's harder than it seems to focus on what your child wants, instead of what you as a parent want and to be completely and unconditionally supportive towards your child's needs.
I've also learned that it's really hard as a parent to not take the lead and to not direct your child, because of course you're thinking as a parent, and that is completely normal, that your child might learn from it if you ask him to mention all the different colors of the building blocks, instead of letting him play freely. 
But the truth is that maybe in that moment your child really doesn't care what color the buildings blocks are. Maybe your child just wants to build a tower or build nothing at all and throw the blocks around or something. Your child probably just wants to play and in the process he will discover how things work and if he doesn't know he will ask you and then he'll be amazed. Give your child the chance to find things out by himself and to be amazed.

But of course who am I to judge? It's always easier to look at something and judge from a distance. Looking back on my babysitting experiences I have to admit that I haven't always been completely supportive and that I don't always give the child all the freedom it really needs to play myself, even though I do try to suppress the urge to take control and I do try to simply follow the child since I've became aware that simply following the child and supporting whatever he does, even if it does not make sense at all, has a positive effect on the child's development.

I'm learning a lot from observing parent-child interaction and I do love to watch parents and children interact but I found out that objectively coding/ rating the quality of parent-child interaction according to a list of criteria is so exhausting and such a brain killing activity. I don't think I'm made for it. I don't think it's made for me, 

because just like being a supportive and a non-intrusive parent when playing with your child, this coding isn't easy, this coding is hard, ap-parent-ly.