We are staying with them and they have custody of their 3 grandkids from my husbands sister. Well the youngest has a…

We are staying with them and they have custody of their 3 grandkids from my husbands sister. Well the youngest has a nasty cough, has for a while I've mentioned it to them and they said "we took him to the doctor, it's nothing" but that was like 2 months ago. And my father in law has a nasty cough for the same amount of time. I now have a dry/wet cough. And my daughter just coughed and is nursing and is making a weird noise. I hope it's not from this cough. I will wait until later this morning when she wakes up but if she has a cough I'm going to cry and yell and ergggggg how do you take advice like that about a nasty cough like that and let it go on for months with a new baby around. Ergggggggggggg 😡😡😡😡😡😡