Does children's standing in the congregational rows—with the possibility of their ablution not being valid—disrupt the prayer rows in the mosque?

We have previously discussed how children should line up for prayer. The best is for them to line up behind the men. However, if there is a concern that they might distract the worshippers, or if the men's rows are not complete, then they may line up with the men. This is not considered breaking the row if they are discerning and ritually pure. The Imam should remind them about purity and the etiquette of prayer and the mosque.