have you ever been inapproval of your brother and cousin's bf/gf?

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i sometimes dislike my brother and cousins girlfriend...i don't approve of their relationship with those girls...like for instance with my cousin ian's girlfriend..at first we get along but after a while,i sensed that she's not doing good to my cousin..they always fight through little things..the girl is used to badmouthing my cousin..and she always threaten to end her life if my cousin does anything she wouldn't like..and i don't like that..i mean if you really love a person you shouldn't act that way or make any threats that would really worry him..it's not healthy i think...but despite of it all..my cousin still continues to be with her,that's why we had a little argument these past week.. so what should i do?i only want my cousin to be with the girl that i think he's worth..how i could i make him realize these things??