First off, I'm extremely biased in this manner. That said, parents with kids need to seriously get their shit together or piss off. What do I mean by this? Most airlines assign their stuff randomly, you go to the airport early and ask the people at the desk to sit you and your kid together, don't come at the last minute and get shafted with the omg I'm not seated next to my kid.
You might ask why I have a harsh reaction. I'm a guy who is 6'3 and I always come early to the airport whenever I fly to get the seats with extra leg room. I learned the hard way my first flight where the dick in front of my refused to heed my pleas to not recline because it was squashing my knees, and my complaints to the flight attendant were "sorry we can't force him to not recline." I ended up with a painful subdural hematoma in my knee that lasted for a good year.
And on other flights I've gotten shafted by parents with kids. Oh sorry sir can you move from the seats with extra leg room we are prioritizing them for kids, WHAT?! WHY?! So the snot nosed brat can swing his legs back and forth like he's in a jungle gym? Tell that kid to sit in a normal seat and have him stfu.
Or the ever hilarious, oh you're in a 3 seat section and you get asked to move because the parent doesn't want someone sitting next to their kid.
Also every time this has happened, or I've seen it happen it's always the person next to the kid who is asked to move, why not move the kid. Hey the mother wants to sit next to the kid and a stranger comes to sit with you. In both cases there is no under text of sorry you might be a child molester.
If the person getting asked to move they better be compensated, putting them in any crappy condition is absolute BS.