[Fred Nerks]

You would make life a lot easier of you posted the images you are asking about. Do you mean this one?

I have tried to answer that previously, by showing you another image:

And I'll let you work out what it suggests they have done.

[WildHighlander57]

That one, plus all the other family pix from Mark’s book that I linked to.

Look at the progression of the pics, and figure out who is the immediate younger kid to Mark.

Need a name first.

Those pics constitute new info, that must be figured in.

And if it takes us in a different direction that we thought it was going, then so be it.