Child Damage Mitigation

Raised 2 now 2 grand kids no problems with floor standers, never been touched.
Was more worried about montors on stands.
Kids take direction remarkably well.

geof3,

...but children actually learn the word “no”.

Did you win the lottery, too?

I am trying to pick the word for this moment. Envious or jealous?

Invert your thinking. Literally. Consider ceiling mounting your maggies. Same location as now, just hang them from the ceiling. I my last house, the perfect location for the speakers would have also destroyed a beautiful view and much of the utility of the room. Solution was to hang them from the ceiling. Admittedly the soundstage was elevated, but otherwise they sounded fabulous. Just be sure to hit for ceiling joists with your mounts, and run the speaker wires through the ceiling, and down the inside of the walls to your amp. 

I had Magneplanar Tympani IVs when my kids were babies/toddlers. These were probably no more stable than your 3.7s. I never had a problem (at least with the kids...the cats were another story). 

Congrats on the little one.  My four year old is number six and more rambunctious than her four older brothers ever were. 

Over the years I've found that what works best with children is giving them lots and lots of attention and not sweating the small stuff.  For example any messing about with power outlets, the stove or my speakers was a resounding "NO!"  Whereas the electronics, the refrigerator or certain furniture, while off-limits didn't get the DEFCON-1 treatment.

By keeping it simple, the kids always know where they stand.

Mark