How can I protect my wellbeing when my sister flirts with my partner?

she isn't attracted to her husband and doesn't get along with him. she told me that she thinks my partner has a good looking jawline and notice his looks. she turns my parents agiasnt me and my relationship with them fails everytime time she comes by. and my partner is also kinda into my sister. he doesn’t really appreciate me in that way but our relationship still continues. my parents dont have the best parenting skills in how to deal with each kid. they just yell at me when she comes by and its without a reason.

what should i do to preserve my wellbeing if my sister does come for a visit?

How can I protect my wellbeing when my sister flirts with my partner?
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