Duplex altercation involving police

[Frank Mwaisaka]

I am new to being a landlord of a duplex and an unsure how to handle this issue. One of my tenants called me because the tenant of the other unit is constantly arguing with her significant other and has had the police called to the apartment a couple times now by surrounding neighbors. The other tenant who has contacted me lives with her children and doesn't want them to be subject to the other tenants arguing. Any advice on how to handle this situation would be appreciated. Thank you