Dad has brown eyes mother green baby blue is he the father?

Yes. This is possible based on Mendelian genetics. Parents can have children with a different eye color than either of them. Let’s say the father has brown eyes because he has two copies of the brown-eyed gene (BB). The mother has green eyes because she has two copies of the green-eyed gene (GG). The baby has blue eyes because he inherited one copy of the blue-eyed gene (b) from each parent. The baby can have blue eyes while the father has brown eyes because blue eyes are recessive. This means that a person must have two copies of the blue-eyed gene to have blue eyes. Brown eyes are dominant, meaning that a person only needs one copy of the brown-eyed gene to have brown eyes.