4th generation inbreeding, have children with birth defects?

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Hello doctor! The doctor told me to ask that my grandfather and my girlfriend's grandfather are two siblings. We are the 4th generation, if we get married, will we have any birth defects? Please advise me, thank you doctor.
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Hi! According to the provisions of the law on marriage and family, it is not allowed to marry or live together as husband and wife between people who have the same surname within three generations. Her case is the 4th generation, legally recognized, but consanguineous marriage increases the risk of birth defects and abnormalities for the next generation.
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Master, Resident Doctor Nguyen Thanh Vinh - Doctor of Obstetrics and Gynecology - Department of Obstetrics and Gynecology - Vinmec Ha Long International General Hospital.