Dating arab girl com
Her parents can't force her to marry someone (forbidden in Islam), only arrange.
You can say you're liberal and all that but don't approve or take severe actions (cutting off) against your sister if she dates a white guy.
If all that doesn't work you could wait until later to get married to her once she has her own place. I would imagine family matters to her, and sometimes that decision can lead to losing family.
I personally would not approve of my sister marrying a white guy.
You could either go for marriage if your committed enough or drop it.
Or you could also date secretly but if you guys get caught, her parents might put her on lockdown or disown her.
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Little stuff like that could help you to woo her family.