Answer:
They will all have brown eyes
Step-by-step explanation:
Blue eyes is a recessive trait, so for it to manifest in the children they will have to possess the two alleles for it and on the other hand, their father possess a homozygous gene for brown eyes which is a dominant trait. When a dominant trait is crossed with a recessive trait, the dominant always shows forth phenotypically.
Lets assume the allele for blue eyes is "B" and that for brown eye is "A"
crossing a recessive trait blue eyes with dominant brown eyes will be;
Bb x AA
AB, AB, AB, Ab
It is noted from the cross of the result that each child possess the dominant allele "A" for brown eyes, Thus, they will express/possess brown eyes which is dominant over blue.