I guess that was a bit harsh. But there is a difference between using
Jacoba for grandfather
Jacob than
Briar for Aunt
Bertha. You could look at
Jacoba and see the connection straight away, where as you couldn't with
Briar. It just seems like a way of betting behind the namee and justifying your use for it. But of course it is your associations with the name that make it special, and I'm glad you liked the two combos. Good luck searching for the perfect name.