Hello My Name Is Stormy And My Question Is Regarding

Hello my name is stormy and my question is regarding my twin boys who were born at 32weeks with twin to twin transfusion they were in the nicu for a month and came home together doin fine. They are now four years old and they both suffer from asthma. I recently moved on with my sister it's goin on three months that we been livin here and since then they coughs phenomena twice they never had it before yes they would get cold and it would always affect there Asthma but since I moved in here it's been worse I do understand the weather been crazy and it's super cold out. But I noticed on the room all round the walls there is mold lots of mold. Can that have anything to do with them being sick and also how bad is it to being exposed to the mold