Does that mean our daughters don't share our ancestry?
Not at all...
Your husband is a heterozygote with both a blue and brown eye gene....brown eye color is the dominant gene expression. At some point in his family tree he had a blue/green eyed relative.
People with green eyes have a blue eye gene too...the eye color gene is subject to variable penetrance which can lead to different ‘shades’ of color from dark brown to green etc.
Your two daughters eye color has nothing to do with their ‘ancestry’...
each of your children