Sister's Disrespect and Pregnancy Conflict

So, my sister is 18, I’m in my 20s, and we live with our grandparents.

She’s constantly disrespectful, sneaks her boyfriend into the house, and now she’s pregnant.

“Recently, she argued with my grandparents again. They threatened

to kick her out if she keeps being disrespectful. Then she told me I should be the

one kicked out… because I’m older and not home much. That was my final straw.

I told her she can’t even finish high school, keeps losing jobs, and needs to get

her life together before criticizing mine. Then I said—she can f*** off and

leave me out of anything related to her or the baby. She cried, called her friends,