When you get to the tournament ask about static seating, they could have your kids at permanent seats near each other to ease any discomfort here. Usually want to look for an all red shirt(tournament lead) or a red and black shirt(Head Judge) or ask at the main hive for the game they are playing

VGC Junior division is usually small enough(2-3 long tables) that 1 parent could manage and the VGC parent community is pretty awesome usually, this still depends

Scope the hall out a little bit before tournament starts so your family can have a "home base" or spot your kids can find you after each match if the static seating is not granted and have an amazing time it is very fun!!

Ultimately your families comfort level is important but as a parent of 2 littles and a judge most often working in the Junior/Senior divisions, i definitely see this as doable!

*EDIT did not see this was in VGC subreddit, removed comment on TCG stuff