Marrying the daughter of one father's wife. My father marries another woman, who is divorced, and the woman already has a daughter from another man i.e., not sister to me, and from different blood.

Salam Alaikum, assuming my father marries another woman, who is divorced, and the woman already has a daughter from another man i.e., not sister to me, and from different blood. Is it permissible for me to marry her? Or, vise versa, i already marry a girl, can then my father marry her mother? Jazaka'allahu Khairan