Hi Alwef,
I think we might be talking at cross purposes

I wasn't suggesting that your family photos were anything other than of one and the same tower

What I was doing was supporting the doubts you yourself had expressed as to whether your tower actually
is the Dunmore Tower - as you said (and I agree) there do seem to be some differences.
Nevertheless, your tower is certainly very similar to pictures of the Dunmore Tower. And is also very similar to pictures of the Airthrey Castle tower. Perhaps one of the folk with local knowledge can comment on whether it would be possible to see either of these towers from a perspective similar to the view of your tower in your family photos (though no doubt there have been great changes to both those areas since the period when your photos were taken).
I guess there still remains the possibility that your tower is yet another tower which hasn't yet been mentioned ...
And - as you have said - it might not be in Stirlingshire (or might not even be in Scotland though you suspect that it is).
JAP