Originally Posted by bergamini

The exact wording is that children be “seated adjacent to the seat of an accompanying family member over the age of 13,” so long as it's the same cabin and one of the sponsors specifically stated it was to eliminate leaving "them at the mercy of other passengers who must decide whether to trade seats". It pretty clearly allows for requiring adjustment of passenger seats to accomplish this and as I mentioned before, that's already United policy. It will be nice to not have a passenger determine when a parent is worthy of sitting next to their child.