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1)给父母办绿卡他们需要办的婚姻公证，是指结婚证公证还是结婚公证？
-Either is OK, but you had better do 婚姻状况公证 because occasionally some IO may not accept 结婚证公证 of the Chinese from Mainland China.

2) 还有只需要办这个公证和出生公证？
-These are required.

３）还有什么需要在国内办的材料？
-If the 户口本 (even if old one) has your parents, names and your name, then you had better also do the 户口本公证.