This is a general Q&A site, not the place for in depth legal analysis. You can go to base legal and/or retain a private attorney to represent you.

You have no grounds to sue, and no damages to sue for. Courts are not equipped to deal with everyone's hurt feelings.

You don't mention anything the apartment complex did wrong that would give you grounds to sue.

The children can't decide this issue. A court will.

You can hire as many attorneys as you want. It is your case.

You can report it to the police and sue him in small claims court.

It is up to a judge to decide who prevails. We can only hazard a guess based on incomplete info.

Your boss is correct. It is not a choice. You aren't going to catch COVID if none of them are there.

In most states it would be too late to sue, but you can set up a meeting with a local attorney to discuss.

Assuming bandith is something that is not supposed to be there seek a refund.