You know, thinking about it some more, you might want to give serious consideration to getting rid of that coffee table, and not just for acoustic reasons. First of all, that will free up a lot more space and open up the area. This will allow easier foot traffic, and it can give your daughter a more open area to play in. Plus, if she is playing in that area, it is a lot easier to supervise her there. Getting rid of that coffee table and just putting a nice soft rug there would add a sense of spaciousness to that room. The coffee table is also a major source of acoustic reflection and diffraction. It isn't doing any favors to the sound of the front stage speakers.
If you are thinking, "where will I put stuff without that table?", there are some good solutions. Use end tables to flank the sofa against the wall, that will give you lots of tabletop surface, and it is well out of the way. Also, consider moving the sub right behind that sofa that is facing the TV, the listening position. You can use it as table. What makes it good for that is the height is a nice match for the height of the sofa back. To protect the finish of the top of the sub, get some rubber drawer liner like
this stuff. Then get a hard table top like maybe a sheet of plexiglass and place that on top of the drawer liner. On that, place a end table like a fancy tablecloth for endtables, and that will hide the sub. Placing the sub there can not only turn it into a convenient end table, it also clears the path from behind the kitchen bar, so it will be easier to walk around there. You will want to get a cable cover for the cabling of the sub in that position so that the cables do not become a tripping hazard.
