I have a question regarding if I would be commiting an act of Haram. My father and my mother got divorced 5 years ago and my mother is currently living with me. My father occasionally comes by to see me and stays the night sometimes because he is currently in between homes. Is it Haram for me to let my father visit while my mother is home? Additionally she doesn’t observe hijab

It is not haram, but your mother needs to wear hijjab in his presence.