How do I handle mold in apartment making family sick?

I'm dealing with a situation and need some guidance.

mold in apartment making family sick. I've been dealing with this for about 4 months now and the situation isn't improving.

I have been renting for 6 years. My monthly rent is $1,000. I have a written lease.

Do I have a strong case? What should my next steps be?

Went through something like this -- ended up getting a lawyer involved which made all the difference.

Just want to point out — the statute of limitations might be a factor here. In some states it's as short as 1-2 years. Don't sit on this too long.