How are these oak trees related?

A gorgeous autumn heathland walk today from Lightwater to Deepcut. Hardly a soul to be encountered on the heathland track bordering the Bisley and Pirbright Ranges.

The soon to be constituted Surrey Heath Tree Wardens charity got me thinking about trees on my walk. I took photos of a number. I don’t really know why, cos we’ve got so many in Surrey Heath. Maybe it was because of the light.

Anyway, to show my complete botanical ignorance, I ask the following question. In my photo of two oak trees, are they brothers? A likely absurd question, or, maybe they’re offspring of a parent. If they are, what do you call them? Now, look it’s Friday, and I did have a nice late lunch at Miller & Carter in Bagshot.