Redheads..

That's the spirit "grannyonasuperbike*!

If your son was distraught last time he found a baby he thought was his wasn't, why would you even consider trying to find out such a thing again, especially as all seems well between all parties. Talk about looking for trouble! How about minding your own business?

Yes, that's blunt, but it's not harsh.

Thank you. I haven't spoken about it before. I think half the problem is that I've had to deal with so much loss myself, I'm 49 now, bereaved of most of my family except one brother, been divorced (now remarried) and after 30 years of working full time had to take ill health retirement. I can see I'm being over protective of my son. Our granddaughter is a real treasure and I'm so lucky to have her in my life. I see her almost every week and she really lifts my spirits.

Brown eyes will generally dominate, so no problem at all with the baby having brown eyes. Genes can lie dormant for generations, hair and even skin colour can pop up generations later.
It depend,s I suppose on what you think about your son's partner. if you have never liked her you might consider her untrustworthy.
Try and enjoy what you have. It really is a terrible accusation to make, and could ruin your relationship with both of them if it is unfounded.

They eyes not a problem at all as the mother could easily have pure brown eyes with two brown genes - the baby has hybrid eyes. Even if the mother is a hybrid the baby had a 50/50 chance of brown eyes.
The brown hair may well turn out to have lovely red highlights as the little one grows. We have a grand daughter with beautiful auburn hair - just a wonderful dark colour. The parents are both dark haired. The little twin boy GS both have golden red hair. Their mother is dark and dad light brown with red lights.

Don't worry about it - my son and also the son of DD have hands like my dad - if you are still worried look at other family features - some things skip a generation.

Ignore the gnawing - that way lies trouble.