Asallamu alaikum waramotullah wabarakatu…
My question is can my step sister cover herself infornt of me eh removing veil and kimar)
Yes, your step sister(the daughter of your father’s wife which she had for another man) has to cover up for you because you are not a mahram for her.
In the Shari’ah you are allowed to marry her. It’s her mother you can’t marry.
Your father cannot also marry her(the step daughter) if she has consumated the marriage with her.
Answered by Ustaadh Jaleel Aromire, Abu ‘AbdisSalaam, Hafidhahullah